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The following are tips that I have come across to help deal with some of the side effects of CNSV and its treatment.

One item that has caused much anxiety for me is my inability to distinguish between disease symptoms and medicine side effects. The following are some of the more common ones and how I have begun to differentiate them. Remember that these are my perception of how these disease and medicines are affecting me. Everyone's presentation of CNSV is different and everyone's reaction to medication can also be different. Hopefully you may be able to find some commonality between what you are experiencing and what I have described.
Headache

Headache is almost a universal symptom of CNSV. It is also a common side effect listed on most of the medicines to treat CNSV.
Most of my headaches that I attribute to the disease feel like more of a pressure sensation with a medium strength headache. The headaches of this type seem to last a long time and do not respond to pain medication.
The headaches that I attribute to the medication are more intense but usually last a shorter amount of time. These types seem to respond to pain medication.

Weakness is also an overlapping condition of both CNSV and its treatment.
One tip is that most of the weakness caused by CNSV is usually focal (only affecting one side or limb, but not both.)
Generalized weakness is most likely a result of one or more of the following:

Cytoxan: Causes progressive, generalized weakness. Should improve as treatment is discontinued.
High-dose steroid usage: Should improve as steroid usage is tapered. You may experience some myopathy and myalgia as the steroid dosage is tapered. It generally lasts about 3 to 7 days but should improve after that.
Anti-depressants/Anti-anxiety medication: Most of these types of medicines including Ativan, Celexa, Zoloft, list weakness as a side effect. Work with your doctor (psychiatrist if you have one) to find the right medicine for you.

Most of my disease flares have been accompanied by a bout of nausea immediately proceeding the event.
Many of the medicines can cause nausea, especially the Cytoxan treatment. The anti-nausea medicine has kept me from throwing up, but just keeps me on the edge.

CNSV can cause a cognitive deficit. Depending on where the vasculitis manifests in the brain, I have had times where I could not count change, do simple math, answer simple questions, and a period of Aphasia. These deficits have resolved. It is imperative to receive treatment for the disease as soon as possible to minimize the damage.
Most of the anti-seizure medicines can also cause a temporary cognitive deficit. Their function is to slow the brain down to prevent seizure. This can lead to a feeling of mental slowness. They can also caused slurred speech, weakness, confusion, etc. They are necessary to control the condition, but just be aware that many of the side effects that you may be feeling could be coming from these medicines, not the CNSV.
One note of caution, I recently learned that Topamax can cause a permanent cognitive deficit. Please check with your doctor if this medicine is suggested as an anti-seizure medicine for you.

While the use of steroids is necessary in the treatment of CNSV, one drawback is the possiblity of developing osteoperosis.
Ask your doctor if it is appropriate to have a baseline bone density scan done.
To combat osteoperosis, the doctor may perscribe Fosamax, a drug designed to build bone.
Calcium supplements, as well as eating foods high in calcium, are other ways to fend off bone loss.
In addition, weight bearing exercise will stimulate new bone growth.
More information on Osteopeosis can be found here (Interactive Tutorial! Opens in new window).

Dry mouth relief. Many of the medicines to treat CNSV can cause dry mouth. This can lead to serious dental problems as well as being uncomfortable.

Drink plenty of fluids. Avoid caffine, alchohol, and smoking.
My dentist recommended a toothpaste called Biotene. It contains an enzyme for antibacterial protection while your mouth is not producing saliva properly. This product also comes in a mouthwash and gum and can be found at many drugstores. I found it at Walgreens.
My rheumatologist prescribed a product called Mouth Kote, which is a topical spray that acts like artificial saliva. It gives some temporary relief unless you drink fluids constantly like I do (which you should be doing if you are receiving Cytoxan treatments to prevent bladder cancer!).
Slippery Elm can also provide temporary relief by coating your mouth and throat.
More information on dry mouth can be found here.

Both Cytoxan and Prednisone can lead to opportunistic infection in the mouth. Common infections include Thrush, and bacterial. If you suspect these type of infections, it may be wise to have your doctor do a test to see what type it may be. Then a medicine can be prescribed to help deal with the infection. It is hard enough dealing with the dry moth without a secondary infection.
My rheumatologist prescribed a product called "Miracle Mouth Wash." It is a mixture that can contain either an anti-fungal or anti-bacterial medicine. It typically also contains Lidocaine, Benadryl, and Maalox. The Lidocaine is a numbing agent that makes you feel like you just came from the dentist. The Benadryl helps to lessen the swelling of the sores while the Maalox coats the sores and tongue similar to what it does in the stomach.
More information on Palliative Treatments can be found here.

Keep hands washed.
Keep hands away from eyes, nose, and mouth.
Avoid crowded places where you may come in contact with many germs, especially in the 7-14 day range after Cytoxan treatments when your immune function will be lowest.
Do not fly on airplanes since the recirculated air spreads germs easily.
Remember that any illness you contract may cause a disease flare and should be avoided as well as possible.

Both Cytoxan and Prednisone cause slow healing from cuts and bruises because of the suppression of the immune system.
This slow healing can lead to higher chance of infection.

The use of steroids can cause changes in eye pressure. It may be most evident after a pulse dose of Solu-Medrol.
Make an appointment for an eye exam and tell the doctor about the use of steroids.
The doctor can then track your pressure every 6 months to see if the pressure is within limits.
Blurriness in the eyes is a sign of a change in pressure. This change may be only temporary but it may be better to be safe than sorry.