I haven't gone to a doctor about this yet, but I am going to this week. I have had 3 periods in the matter of 5 weeks. They have been full periods, all heavy, very painful cramps, and lower back pain. I do not take birth control. I am married, so yes I am sexually active. I am not pregnant as far as I know. I just had a pap in December and it came back normal. I'm really concerned about this, this time around it's especially painful. I don't know if this matters, but I am 24 years old. Thank you for any replies!