Welcome to NeuroTalk:

Cramping and spasms often respond to magnesium supplements.
A good oral chelate (not OXIDE) may help. Also there are creams/lotions you can get, but where you are, they may not be available. (chelates are citrate, gluconate, taurate, malate, etc.)

This is my magnesium information thread for more details:
http://neurotalk.psychcentral.com/thread1138.html
Magnesium blocks the NMDA pain receptors, increases blood circulation to areas in pain, and relaxes spasms and over contracting muscles.

Try some wet compresses with epsom salts in water... 4 oz to a small tub and warm water, if someone can put these on your back for you and refresh them?

If you can get into a bathtub, you can do it that way... 8oz to a tub of lukewarm water. And soak at least a 1/2 hour. This may help.