Honestly, that sounds like me from, like, always, except I never had a two day period! I went 10 months one time without a period at all. I had one period that lasted 7 months. Often I'll go two or three months without a period. Then sometimes I'll have periods practically back to back, with maybe only a few days in between them. Most of my periods last at least 10 days with REALLY heavy bleeding (like changing tampons every 15 minutes and using a pad as back-up), clots, and used to really bad cramps. I'm 36 now and the cramps have eased up. I've had everything checked, including an endometrial biopsy (done without any pain meds or anesthesia, seriously the worst pain I've ever felt), but everything is "fine" - except I have PCOS making me fat, giving me facial hair, screwing with my cycle, and making me basically infertile.

But you should definitely talk to your doctor about it. The bad cramps, especially if it's not just around your uterus, but other abdominal pain, could be endometriosis. They should be able to do just some blood work and a sonogram to see if you're enough at risk for cancer to do a biopsy. They usually only do those if you're older, or if your uterine lining is super thick.

Relax though. Really horrible periods and cycles are almost never signal cancer. Sometimes people with cancer get them, but most of the time it's just your hormones being completely screwy. Have you tried birth control yet? I can't use it because it reacts funny with me, but my OBGYN swears it's the best PCOS treatment for regulating cycles.