Wow @rjk this is really helpful! Just read your post from October 15th as well and the news about the diet is heartening, especially with such intense symptoms. I should try that out and see what happens. Just to reiterate for everyone—my heart is normal and I don't particularly get palpitations anymore. I've started moving around & getting more physical activity in. But the internal vibrations and finger twitching (which I posted about in another group) are still very much there. Parasthesia in my arms showed up again a few times in December, making it hard for me to sleep.
Just last week, I was barely able to sleep because I had internal vibrations all over my body….usually they have just been confined to my fingers. I was able to sleep just fine last night without them bothering me so I suspect it may have something to do with my period, last week, and the gas build-up that usually comes with that. The SFN sounds very plausible though. Literally all my problems seem to connect to my gut health, just like yours. I got a second blood test that tested my liver last week and will be seeing the results tomorrow—will update if it's abnormal.
Will look into SIBO!
(Just FYI—I'm trying to share as much information about my condition as I can so that people suffering similarly can see what matches. Sorry if anything is TMI)