Should I Be Worried For The Heart Palpitations That Feels Like Aflutter Of Nerves And Doctor Diagnosed For Anxiety And Stress?

Hi,
I saw my Dr just before Christmas as I was concerned about starting with heart palpitations. I don't get them all the time usually when I feel tired or stressed and sometimes before I go to bed when I relax. It feels like a flutter of nerves in my chest, sometimes in my neck, and I sometimes get a pain in-between my shoulder blades. The Dr checked my blood pressure which was fine and also my heart rhythm which he said was strong and good. He feels I am suffering from anxiety and stress caused my the death of my father March this year and signed me off work for two weeks. I had palpitations after the death of my grandmother in 2008 and went to the hospital for a 24hr ECG and an ultrasound on my heart as they found a very slight murmur. Back then they weren't worried at all as the results came back normal and they said my murmur was very faint and I probably had it from birth and I was just suffering from stress. I haven't had palpitations again until now and since having the two weeks off in Dec I have improved only occasionally get the palpitations but they haven't gone altogether and they still worry me which them makes them worse. I try deep breathing which makes a difference but I just wish they would go. Should I still be worried that I am still having them 1 month on? Catherine.