Burning and tingling. What should i do?

Hello About 11 months ago I passed through brain stem glioma tumor surgery. After surgery I am feeling burning, tingling and pain in my left side of body. This symptoms happening through out my whole left side ie from leg (ankle, limb,thigh,left egg of testis) to hand(wrist,forearm,arm, shoulder) and left side of neck and skull also. When the cold water touches to the affected part then I feel that someone has dips a needle or pin to me. And when hot water touches to affected part then I feels no sensation on that part. I feels like a normal water sensation. Due to these symptoms I am feeling very pain and problem in my left side. Please help me to sort out this problem and tell me what should I do? Tell me proper medication and exercise if available . Please help me ASAP