What is cystitis? Who can offer me the best medicine to cure my cystitis?

Two days ago , I felt burning when I am peeing,my urathra was very sore and I had frequency of urinatior ,too ! It was really frustrating for me, I had seen my doctor,but ,her therapeutic method was uneffective and I still feel very bad today , so , I am here to look for some better solutions , who can offer me the best medicine to cure my cystitis? I need your help, it is really very urgent!