My heart palpitations got worse when I over-extended myself physically. They were pretty much gone (late spring this year) then I started swimming this summer. I actually felt it "trigger" the heart palpitations back into starting again. When I exercise too much, which is not much at this point, it actually is jarring to my body -- I'm wide awake at night. So there's definitely something "bigger" happening in the body than just over-exertion. It feels like a clear domino effect. So, I am very cautious now to not over extend myself at all -- physically, mentally and emotionally too. The heart palpitations are the only remaining symptom I have, long-haul wise.

I may try an ice bath again because this has worked as a "reset" for me in the past.