My doctors have said my fast heart rate is due to the crps/pain. The only thing that has helped me in that regard is lowering the pain levels. The worse my pain...the higher the heart rate and it's not uncommon for my resting HR to be 110+ and even just a short walk to bring it to 150+ (like...just across the room type short walk). That said...my last Dr appointment it was at 96 when they checked it which is the lowest I've seen it in a long time and I attribute that to the pain relief I've been getting in my leg from the DRG. New doctors always freak out about my HR and it's been frustrating any time I've gone to the er for anything else because most of the time they completely ignore my other complaints and focus on the heart rate. Wish I had more suggestions for you...I am very worried about the long term effects of the HR issues especially when all my relatives on my dad's side have died of heart issues when they were still pretty young.