My Dr. Guess That, I Have Endometrosis. Heavy Pain, A

My Dr. Guess that, I have endometrosis. Heavy pain, a killing pain have occurred in time of period. I am in observation for 1month, prescribed by tab b-long f, and novelon, bcoz I have pcos also. My age is 30, unmarried. But the Dr. advise me decolic as a pain killer, but it is not working. Then, please tell me a pain killer Dr. which I can take atleast first two days in my period. Can u? I am going through with this pain.