(((LT))) A comment about the panic attack - my heartrate went that high while i was at a Chinese restaurant, and i called an ambulance to take me to the ER! It would not slow down so i could drive. They determined that my sodium level had gotten too high because my diuretic for blood pressure had taken out too much potassium and then of course the chinese food, so they ended up adding beta blockers to control my high blood pressure.

I would let your gp know about these fitbit readings. You are waaaaaay tougher than i am, i am a big baby about my heart rate getting out of control. An hour seems like a long time.