You are having left side paralysis after the operation of brain toumer?

That happens. Tell your neurologist. My right side was paralyzed from epilepsy. After a number of doctors could not help me, I went to the Mayo Clinic. The Neurologist there put me on large doses of limictal and topamax. (He started small and increased them gradually.) Now I have regained most of the use of my right side. Sure, those are two totally different problems but both problems affect the brain. There might be a treatment that can help you. I can not help you but perhaps a good doctor can.