Could it be trigger-point pain? Dunno.

Have you ever tried a chiropractor? I know a lot of people with dysautonomia think that chiropractic care can be scary but think about it a lot of times our problems lie in our central nervous system shouldn't we go see someone that gets right to the root of that problem? I have been seeing one for a year and a half or so and it has improved my condition. It's not a miracle worker because there are so many other things involved but that was a good start.

You should definitely try a chiropractor and maybe a masseuse to manage muscle tightness.