Well I took advice on buying the book "Self Help for your nerves by Dr Claire Weeks" and I cannot believe how much it has helped me... the heart thing ...fast pulse .. flutters... thudding/pounding heart... she explains it all.... it IS harmless... she explains how are heart becomes ultra sensitive to its beats when we are experiencing stress and even after having ONE panic attack it can start the cycle ..fear...adrenaline.. she says it cannot harm your heart!..... I need to express so deeply to people on here who worry about thier heart to buy this book WHENWILLTHISEND ... you must buy it!... It is as if when u are reading it she is said with her arm around you explaining the syptoms ! All these yrs I have wasted hoovering over my pulse and worrying and centering on every beat... I still am !! will take time but I can say will honesty I feel a bit better.
I got the book from eBay for 99p... here are some links....
http://cgi.ebay.co.uk/Dr-Claire-Week...QQcmdZViewItem
http://cgi.ebay.co.uk/SELF-HELP-FOR-...QQcmdZViewItem
Hope this helps... or try amazon