Sounds very similar to what I’m going through but vax started it and then caught COVID last December and have never recovered and getting worse by each day. I too have dehydration and sensitivity to everything even water any supplements and was diagnosed with Mcas and my gut is in so much pain it feels as if it is detaching itself along with my muscles, ligaments nerves dying and such severe muscle cramps, spasms , twitching, severe weakness.. numbness tingling in limbs and in face ,severe joint pain , headache, rashes, breathing difficulties, brain issues,lymph’s and gland’s constantly swollen and hard as rock. Muscles feel like they are going to squeeze me to death. Eyes on fire , eyelids red and swollen, Dry mouth. I did do a few tests of my own and very had high arsenic levels, cesium, thallium and robidium. I did a mold panel because I was also exposed to mold and they came back positive. I could probably go on and on hope this even makes sense for I feel brain dead.Also I do feel I have connective tissue disease and have thyroid disease and stage 3 kidney disease.