IBS Concerns: Need Help

I am 25 year old male who weighed about 190 lbs 6 weeks ago. Now i am sitting currently at 178. I have lost 7 lbs from keto and another 5 in the recent two weeks from the nausea that is apparently due to ibs.

My story starts about 3 months ago where i had a gnawing burning constant pain in my upper left abdomen. I didn't think much of it as i had acid issues before. The pain actually got better as i ate PPIs(Lansoprozole) but it got triggered again through eating spicy food. My doctors at the time maybe thought it was an ulcer so an endoscopy was scheduled for two weeks ago that came out clean. Eventually that burning gnawing pain subsided. But a week prior to the endoscopy i went on the keto diet for 8 days to lose weight as i thought i was getting fat. I abruptly exited the diet however due to keto rash, and introduced carbs straight away into my system. This is where my ibs symptoms began. The day after i first introduced carbs, i drank a fruit shake with milk in the morning for breakfast and it completely rattled me, giving me nausea and heavy gas. These symptoms eventually worsened and gave me tightness/pressure in my back and abdomen which i am currently suffering from. I suffer from loss of appetite, nausea(worse in the mornings) and the back and abdomen tightness/pressure.

I've been to the ER, all my blood tests and ultrasounds/xrays for the abdomen came clean. They didn't give me a ct scan because i had one 2.5 years ago that also came back clean. I recently had an mri without contrast done at an imaging center, all my abdomen seemed normal according to the report. I recently went to another GI, and am having stool tests done as well some thyroid tests. I also plan to get a SIBO(small intestine bacterial overgrowth) test shortly from another gi specialist, as mine currently did not offer it.

I feel like i have done every test in my power to rule out the bad things, maybe another colonoscopy could help idk. I feel like if my nausea was a problem of anxiety and stress it would have subsided, but it only feels like im getting worse. I feel drained after eating as well, just a feeling of weakness. I have lost drastic amounts of weights over a short time and am starting to doubt the tests i have done.

What should i do? Should i be worried about my weight loss and neverending nausea? Is this tightness in my left back and abdomen normal? I start burping immediately after i eat for a very long time. Starting to become very concerned even though i have convinced myself that i have done everything in my power to make myself feel better.

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