Welcome to Neurotalk:

While I cannot comment at length about your medical condition, I can give you some information about your drugs and supplements.

Statins require CoQ-10 supplements because Statins block the enzyme in our livers to make it for us. This results in mitochondrial failures in the body and other negative things as well. I don't see CoQ-10 on your list. You will need at least 200 to 300mg a day of a quality form with enhance absorption listed on the label.

Also a new side effect of statins has come to light-- damage to the lungs:

http://erj.ersjournals.com/content/19/3/577.full
While this is being published in Europe, I have also seen a remark from England about this side effect. If your COP started after beginning the Pravachol, I'd discuss this with your doctor.
Information is still new on this.

I'd make sure your magnesium is NOT OXIDE form, and IS a chelate instead or chloride. OXIDE is not absorbed well.
Prednisone depletes magnesium, so using a magnesium supplement that is absorbed is important. You can also try lotions with magnesium in them, to rub on your legs if you prefer that. CVS has a lotion called Epsom Lotion, that is nice.
You won't need the oral if you use the topical. YOu can also soak in epsom salt baths to help get some magnesium into your legs. Many with RSL syndrome get better with adequate magnesium.

Long term use of acid blocking drugs lowers B12 absorption. So I would get that tested, and if you are below 400, I would use a quality methylcobalamin (activated form) to correct. Take only on empty stomach. If you are very low say in the 200's or below, start with 5mg a day. You will have to buy this online, but it is not expensive.

Also get tested for Vit D. The amount you take in your Calcium is no where near enough for most people today.
Here is a thread with the new medical information on D:

http://neurotalk.psychcentral.com/thread92116.html

When you use alot of drugs, you end up with side effects because drugs can upset your metabolism.

This link online:
http://www.chiro.org/nutrition/ABSTR...orticosteroids

and this new app for smart phones:
http://itunes.apple.com/us/app/nutri...432547190?mt=8

These two links have details about nutrient depletions caused by drugs.