Suggest Treatment For Heavy Bleeding, Bloating And Nausea

Hello Sir, Am 46 yrs old and have regular period (5 days) from the beginning till May. May my period is extending (DUB) as diagonized by Gyneac. She prescribed Crina 10 mg to be taken for 20 days. I was put on one tablet per day for 5 days but as the bleeding didnt stop this is now increased to 2 tablets per day. Am feeling unfortable, stomach bloating, occasional pain in lower abdomen, nausea and sleepy most of the time. What are the side effects of this tablet. And can i stop this after the prescribed duration.