Menstrual Cycle :: Alternating Between 19 Day Cycles And 44+ Day Cycles

Lately my periods have become increasingly strange. (I'm 22).

They have always been irregular (23-34) day cycles, 4-7 days long and moderately heavy but not horrible.

The past few months they have been alternating between 19 day cycles and 44+ day cycles.

Periods from the long ones start of so heavy that soak through tampons because I can't keep up with changing them for the first 2-3 days. I'm dizzy, nauseated, I can barely breathe when I stand up and almost black out even just walking around sometimes, intense migraines, indigestion, constipation, need to pee all night and my entire pelvis hurts, my hips hurt and pain shoots down both legs. My lower back aches but not horribly until after my period is over.

The short cycle is such a light period I barely have any blood on a tampon after 12 hours for the first 4-5 days and that's it, occasionally it will end in a single day of heavy bleeding and then be over. The pain is still there 2 weeks before these periods and is so bad in my hips that just standing or sitting for too long makes it worse, same with laying face down. I have intermittent pains in my left pelvis. I haven't been able to get pregnant in 2 1/2 years after having a child 6 years ago without a problem.

I had a pelvic exam done and my gyno said my uterus was enlarged and ordered an ultrasound. I had my hormones tested but they looked normal and I'm so confused by this. I had a csection 6 years ago could this be the cause of it since it doesn't seem to be hormonal?