Thanks Mindasch! I knew I wasn't crazy
I had the same experiences you had and a clean healthy heart check. Sometimes I also get an "internal tremor" that feels like it's my heart racing but it's not, just shaking in my torso with a normal heart rate - usually comes in flares and wakes me up during the night.
Glad I'm not the only one. I started to think it could be MS related - still no dx here either.