Iv Always Had Heavy Periods That Lasted 7-8 Days The

iv always had heavy periods that lasted 7-8 days the last year they hav gone lighter and shorted about 3 days but uv been having terrible pain on and off every month worse after my period I also get shooting pains up my bum leg pain and lower bk pain pain durning sex which feels like it shoots right into my tummy...iv been peeing a lot b4 bed but when I wake I'm in pain because I need to pee I hav also being trying to get pregnant for over 2 years any ideas what could b the problem ?