You are the first person (other than myself) who has ever discussed or inquired about NMH on a lyme forum since I have been aware of the condition or around the forums (at least that I have seen). Kudos to you!
I also fully related to the symptoms of NMH and knew exactly that I experienced this condition from the first time I read about it in Burrascano's work. It fit me perfectly. Yet I had to deal with it for a few years unti I discussed it with my (then current) LLMD, he explained it as a form of dysautonomia (= dysfunction of the autonomic nervous system; which is a broad term, but does apply) at the time he suggested xanax as treatment for ME (surprisingly this is a typical treatment for NMH - at least by those doctors who are smart enough to know anything about it ) Unfortunately, I don't like or do well with xanax (in any dose) therefore it wasn't an answer for me. If you google it, you will find alot of helpful information regarding it, treatment, etc. I am not sure what exactly has made a difference for me, but I no longer suffer from this. So, I never treated "it" but by treating other things, I have eliminated it somehow.
I feel for you. I really do. This was probably my biggest issue for along time and not one doctor (besides the LLMD I came to have) ever had a clue! It was a horrible experience for me. It could last for minutes or hours and begin with seemingly no warning or cause.