I mentioned mast cell activation syndrome (MCAS) in my second post above and included a few references. MCAS and POTS are two conditions but they often occur together.

Also, do you have hypermobility of the joints? If so, there's a third condition that is often associated with both MCAS and POTS: Ehlers-Danlos Syndrome (EDS). You can watch a short video (3:47) of a doctor who specializes in these three conditions being interviewed about MCAS on a local news channel: https://www.youtube.com/watch?v=qYAhg4KsH4A&t=1s. Be aware this condition is more common in females; however, it is not entirely uncommon in men and children. I highly recommend you look into this, if for nothing else than to rule it out. It could explain a lot of your symptoms.

One last thing: It's not always junky foods that cause problems. Sometimes, we can be allergic or sensitive to healthy foods. I highly recommend keeping a food journal for a couple of weeks to see if you discover a correlation between any food consumed (particularly gluten) and your symptoms.

I've included a few additional references below. I also included references in my earlier posts.

Take care,

-SA

Mast Cell Activation Disorder and Postural Orthostatic Tachycardia Syndrome: A Clinical Association
https://pubmed.ncbi.nlm.nih.gov/34398691/
A Tale of Two Syndromes – POTS and MCAS
https://dysautonomiainternational.org/blog/wordpress/a-tale-of-two-syndromes-pots-and-mcas/
The relationship between mast cell activation syndrome, postural tachycardia syndrome, and Ehlers-Danlos syndrome
https://pubmed.ncbi.nlm.nih.gov/33980338/
The Trifecta: EDS, MCAS, & POTS
https://www.jimharrismd.com/doctor-for-mcas-eds-pots