Muscle cramping also can be due to faulty calcium levels and poor magnesium intake.

When these two don't have proper ratio in the body all sorts of weird things happen. Too much calcium with too little magnesium leads to cramping muscles.

I have a magnesium thread here:
http://neurotalk.psychcentral.com/thread1138.html

Also very poor levels of Vit D can impact calcium absorption, and lead to many problems-- pain, and poor calcium levels because Vit D is critical for calcium absorption. Low Vit D is connected to cancer too.

Please watch this video:
http://neurotalk.psychcentral.com/thread92116.html

Prednisone upsets many nutrients in the body with chronic use:
http://www.chiro.org/nutrition/ABSTR...steroids.shtml

When people have very serious treatments for cancer and other serious conditions the drugs used do have an impact on the body. Many doctors do not have the training or understand these effects, and that is why I post here about them.

And lastly you need to find out what his B12 level is. It should be above 400-500. Get those numbers when you have the test.
Low B12 impacts neuro functions.

Your husband is going thru alot! Please read here carefully, and perhaps more than once, so you can get a gist of what is possible that you can improve.