Hi Confabulous,
I'm
not a doctor but I didn't think your heart rate appeared overly excessive, however I'm sure one of the many medico's that frequent this site will give a more accurate assessment than I can.
In any case the heart "pounding" and "cold/tingly" sensations do not sound right so without wanting to sound alarmist (as I'm not qualified to assess your symptoms), I would
strongly urge you to go to your doctor ASAP (i.e. today if possible or tomorrow at the latest) and get it checked out.
Without wanting to offend, starting a diet and exercise program to lose that excess 3 stone will no doubt be a recommendation made to you and should become a high priority. Also, if you smoke, stop immediately (easier said than done I know) and if you drink excessively, try and cut down on your alcohol intake.
All the best
.
VH-MLE