Same! I just posted this on the Long Haul FB pages I'm on. I did treat for h-pylori gut infection recently and Strep. Now it seems tolerable. For me I think it's vascular or respiratory as I've been dx with Factor V clotting disorder and have micro clots in my lungs and EDS. I will have my D levels checked but in April they were good after supplementing all winter. I agree it could also be the autonomic nervous system. I had the SGB (Stellate Ganglion Block) done last September and it helped with many symptoms, but got Covid #2 this past March and some symptoms are back, so may need it again. I wouldn't discount a low lying infection, either. I also had this with lyme disease, so goes to say it could be parasitic or bacterial causes, too. Ketamine. Been reading a lot about that. Where do you get that done? Referal or prescription needed? -Kris