Kaya, your case sounds complex so I won't comment too much here. But ANYONE experiencing long haul symptoms has a problem with histamine levels and inflammation in the body. That is precisely why the body starts breaking down in so many ways, in so many systems. Western medicine treats symptoms one by one, and does not look at the whole picture (systemic inflammation).

You may "eat very healthy" but unknowingly be eating very high histamine foods (tomato, citrus, avocado, anything fermented etc). Once I cut these foods out, I improved drastically. It's not permanent, just long enough to get the symptoms under control. I already was not eating dairy or cane sugar but this type of diet also necessary to reduce inflammation as much as possible.

The diet/protocol mentioned, along with B-3, WILL help bring the immune system and nervous system into a much more "relaxed" state in order to be able to rest and actually recover.