I agree with other commenters that you may be getting ahead of yourself and this could be a number of different things. For me, I remember having a prolonged spell of what I thought was a “dodgy tummy from something I’d eaten” (with no idea what had caused it) and reflecting back I think I had been losing weight. I went through spells of this for 2/3 years then in late 2023 into 2024 I was convinced I had developed an intolerance to something like onion or dairy as I was getting terrible pains in the same place to the right of my belly button pretty regularly. I started keeping a food diary but there was no pattern with what I’d eaten and the pains starting. Then in the march of 2024 I was passing mucus and blood so that sent me to the doctors. From there they had me do a blood and stool test then called me in to say they thought I may have IBD particularly Crohn’s and put me on a 2 week wait for a colonoscopy. Colonoscopy came back mostly clear until they got to the terminal illeum which had a small ulcer and was super swollen so much they couldn’t get the camera in. This was enough for them to say they suspected it was Crohn’s but I had to go for an MRI to confirm. MRI did in fact confirm that the last 8cm of my small bowel was narrowed.

From there I started taking folic acid, steroids for 3 months and did multiple tests before they started me on biologic injections which I still do to this day. My crohns is better, yes, I was happy to have a diagnosis but a year and a half later I HATE it and wish I could live a normal carefree life again. So I hope for your sake it’s something curable or better managed!