I get a lot of cramps in my legs. also i feel severe pain in my thighs when i stretch my legs. i have sciatica. please suggest suitable treatment.

Stenosis: It's difficult to tell without more history, but it's possible you have lumbar stenosis which is a narrowing of the spinal canal. Your pain doctor can help sort out the treatment options.

Given Your Pain: I would suggest seeing a pain/spine specialist to evaluate you further to evaluate what level and what can be done to treat you. There are interventional treatments besides medications and surgeries that might reduce or eliminate the pain altogether.