Kinda scared possible endometriosis!!

Hi, sorry if this is TMI but I’ve recently had horrible problems with my periods like, heavy bleeding, really really bad period cramps ( to the point that I have days upon days off school ) and pain with bladder and bowel movements. I’ve have my period for a couple years now and I’ve never experienced these symptoms with my periods, so I went to the doctor and told him all my concerns about my cycle and he said it could possibly be endometriosis also before all this started I had a cyst sooo I’m kinda scared it could possibly be endometriosis I’m going to see a gyno in a week.