I'm wondering if this sounds normal...I'm sorry for all the TMI!

One month I will have an extremely heavy period. Mostly red in color with some clots. The next month my period will be very light, almost no bleeding. But what bleeding there is is a dark brown color, with clots. This goes back and forth every other month.

Each month I have cramps and lower back pain that start a few days before my period. My vagina feels very sore, heavy, swollen. I have very bad diarrhea (which I deal with all month long but it's worse during my period). I'm always tired and I have a headache.

I know noone can diagnose me and tell me for sure, but has anyone else dealt with anything like this? I don't know if I should be worried or if this is all normal stuff. And again, sorry for the TMI. I'm anonymous and still embarrassed to post this lol.