Haven’t had my period in 2 months.

I’m having periods without the blood and ONLY CRAMPS last time(my cramps hurt so bad I wanna throw up) I had my period was April 20th my periods are heavy most of the time and last long like the whole week and I’m not sexually active or anything I’m young you know? They are abnormal, but they usually don’t happen at the beginning of the month usually only the middle and the end. It could start at the end of a month like for example it could start May 2 and end May 9th and then three days it could start again idk I also have low platelets and low iron and I’m 85 pounds(IF WEIGHT HAS ANYTHING TO DO WITH THIS) idk what’s going on with me if someone could help would be niceeee🙏