Ok, cool, thanks for the responses.
The reason I was asking was EDS Ehlers Danlos Syndrome has those things in common.
I joined a group of people on facebook, I haven't been diagnosed with it, (well, I was told I have the Heds version (hypermobility) but almost everything they talk about I share in.
What the most important thing to know about it is, that a gene mutation called MTHFR is likely responsabile for all of its symptoms.
Also, EDS, POTS and MCAS almost everyone in this group ARE autistic! That is shocking to learn.
By taking B12 with MTHFR, you help many of its symptoms so they don't progress.
https://a.co/d/4RKjvDj