How To Treat Frequent Headache And Fever Post Surgery For Tumor In Uterus?

before 2 months one tumer operation has done on the uterus of my mother.After 1 month of that operation , One day suddenly the pressure rises nearly 200. that time her lip,leg,hand bended and she became senseless. After treatment she was fine...but now again some problem arises. sometimes fever comes and she is suffering from head pain. What should do at that moment? please help.