My doctor has asked me to go on the pill for years. I'm married,...

My doctor has asked me to go on the pill for years. I'm married, and not really interested in it to prevent pregnancy-I can use condoms. I am simply on it for medical reasons since I have heavy periods with cramping, constantly get ovarian cysts, and I'm anemic. I am trying to hang in there, but I've had my period for two weeks straight now and this is my third week of pills. I take it at 7pm, but every morning I get up with horrible stomach pain regardless of what I eat or if I eat even anything. I know it has to be this pill. I really don't want to stop this one just to start another pill with another list of side effects. Any advice to when the abdominal pain will go away?