Struggling with Endo/PCOS: Need Advice!

Hi guys, I need advice from anyone with Endo/pcos/generally fucked up periods! I've struggled for a really long time and tried a lot of hormonal birth control methods to stop my period cuz when I don't do anything the pain is so bad I can't move and I throw up/ am pretty much immobilized for like half of my life. I was on the pill for a long time but it would do this thing where every three months I'd just start bleeding and it was painless but didn't stop unless I paused the pill for a week or so. I once bled for over 90 days straight . I also have a rlly sensitive stomach so I had to stop taking a lot of methods due to it worsening chronic nausea and am currently trying the ring. it worked for me for a while but similar to the pill, on month three I just started bleeding, except this time it's accompanied by very painful cramps, backaches, messed up digestion. I took out the ring after a week and a half of pain that was resistant to the high dose omega 3 that usually helps my cramps. I messaged my doctor because Ive had to take 10 ibuprofens a day and I'm concerned for my health if I keep this up. she was dismissive of my concerns and told me it was "normal" for teens to have irregular periods and to try acupuncture when I've been menstruating for 7 years and have tried acupuncture and have talked to her extensivelt Abt this stuff and do multiple doctors have told me I probably have PCOS/endo but haven't tested me. I'm starting to get weird stomach aches and lose weight and have been bleeding for 2 weeks now and it's getting heavier and heavier and I am scared I'm gonna give myself gastritis from all the Advil , does anyone have an idea of what might be up and what I can do to remedy it?