My wife also has MCAS, POTS, and a connective tissue disorder that is not at the level of EDS. Was diagnosed about 4 years ago and is on treatments to suppress some immune responses, that has been helpful at taking the edge off some symptoms. It was like tumblers clicking into place when she saw a specialist and got the diagnosis, so many rather disparate, long-term symptoms all from the same cause.
POTS, MCAD-like (hyperlipidemia) and inflammatory conditions are triggered by CFS/ME as well.
I am really puzzled: are we dealing with the same thing but under different names?
For reference, NSAIDs combined with high-dose vitamin therapy help to resolve those conditions in people with CFS/ME.
There are tons of people (mostly women) out there with this set of conditions, and they're only starting to be taken seriously. It's a set of life-altering conditions and dealing with the medical system when you have it can be infuriating and exhausting. I hope you don't have any of these things.