Caught Covid right after my second Moderna booster, don't think the booster had anything to do with it - just the evolution of the virous and the fact the populous seems to think its ok to ignore it since it is the common belief that it's no worse than the common flu now - big mistake. Just got the third booster (I'm into month 7 of long covid) and no new complaints.

As far as gastric problems I'm into week two of a new over-the-counter-probiotic, VSL#3 and actually have seen significant improvement. you won't find it on the shelf as it has to be refrigerated so you might have to ask your pharmacist to see if he has it in the frig behind the counter or can order it. I've had gastric problems for decades that finally found to be diverticulosis in the upper intestines last year - doctor informed me that there was no cure so get use to the symptoms. My last visit he recommended this probiotic, so I started 8 days ago and its now my go to product. 15 years with virtually every brand on the shelf with no evidence of relief and this one actually performed or was it the third booster? Search - VSL#3,NIH - and read the write up.