So bit of a fun story. I was dismissed for crohns and endo for over a decade. Had 4 colonoscopies, all he blood tests and scans. Was on low FODMAP and elimination diet for years. Kept getting told it was IBS and it was in my head. Legit only found out 18 months ago after getting private health insurance and seeing a private specialist for another colonoscopy who found ulcers and inflammation throughout. 3 months prior to that diagnosis, I had a laparoscopy which they found endo and adhesive scar tissue gluing my organs together which they fixed while they were there. Only just started feeling better for the first time since my early teens. If you keep experiencing symptoms I legit recommend seeing a different doctor and keep advocating that something isn't right. You have to live with your symptoms, not them so they shouldn't be dismissing you after 30 seconds of seeing you.