Help diagnose my stomach issues

Female/29; fair health besides lack of nutrients from this issue

I feel like my stomach issues are a medical mystery of sorts and I would like to hear some ideas on what I can do.

My whole life I have had issues eating. As a baby, I would get stomach issues from feeds and as I grew older have continued that with foods. As a kid I ate unhealthy as kids do. As I grew older I found the things that made my stomach hurt the most and avoided them (sugary foods like cereal, hard to digest foods like kale and meats, even avoided large amounts of alcohol due to severe hang overs even after 4-5 beers). I went through testing a lot as a kid such as lactose, allergy tests, ulcer testing. I just continued to avoid foods but still was in pain every time I ate. A few years ago, I saw a holistic practitioner to try and narrow down my issues. She mentioned I could have a low acid production and I started taking HCl which immensely helped me stay comfortable when I ate. That worked for a few years. Recently, something got triggered and I can barely eat without pain. I have gone through many tests already. Celiacs, stool tests for inflammation, tick diseases, thyroid which have alp come back negative. My doctor decided that I should try a proton pump inhibitor to see if this helps, but I have not seen a difference with this. My next test is an endoscopy which will take 3 months to get in for. With my lack of eating and nutrition, I’m not sure I will make it that far and my doctor will not put an urgent note on my referral and advised me to seek help at the ER instead.

I have seen a GI specialist which gave up after 2 tests and is convinced it is ‘just inflammation’ which would be fine if I wasn’t in such horrible pain and has not given me an ideas on a fix or how to manage it and said ‘try peppermint’ to help. If I could fix it with peppermint, why would I be here? The one plausible option was to take low dosage depression meds to help, but I have horrible side effect from these meds. I asked for a genetic test to be done to determine the best meds for me to try and this was met with ‘you have to go to a psychiatrist for that’.

I need help and I feel like no one is taking me seriously. Anything helps! Thank you.

Tldr; I have tons of stomach pain when I eat anything and have done a multitude of tests that are all negative. Suggestions on what it could be and plausible fixes please.