Sounds horrid. Sorry you're going through this uncertainty.
I've friends with endometriosis, it's unpleasant, ditto PCOS, they're common enough but can cause discomfort and in the case of endometriosis, my local friend who has this has horrendous pain and problems during her moontime. You're doing eveyrhting you should because they're looking into your situation. I would not worry because if it is something nastier, they're onto it already.