This isn’t normal but nobody’s helping🙄

So around 3-4 months ago I started on the pill and I never missed a pill. Up until November last year my periods had never been late and I’d never missed one, I’ve always had heavy and agonisingly painful periods. However since starting the pill I had a rly long period and it was agony like worse pain than any the surgeries I’ve had. So bad I ended up in hospital and even the gas n air wasn’t good enough pain relief. They said it might be my body getting used to the pill. I’ve been back to the doctors 3 times since then and they always say it’s my body getting used to it but I feel like there’s something else going on. I’m getting my period more frequently now and I can’t track them properly and can’t predict them as I used to. Idk what to do anymore as everyone brushes it off.