hi I have the same problem, been dealing with generalized anxiety disorder now for 4 months and I am on meds,changed my whole life style,I do Yoga every day.quit smoking,drinking alcohol, excercise but I still have heart palpitations sometimes or my heart will race.....not all the time even tho I take meds it does not stop me from having those symptoms sometimes....I hate it at times because I am doing everything I should be doing...but I guess in time it will work...but the anxiety still comes every now and than out of the blue...so we have to learn how to cope with it..take care and god bless.