definitely sounds like anxiety. i have anxiety and sometimes have constant heart palpitations from it. check your sugar intake. are you eating properly. not having too much caffeine. check your potassium levels too. all those could be effecting your heart rate as well.
it feels like my heart is racing but my pulse rate is normal and i feel out of breath. what could this be? . i do suffer from anxiety. i have taken natural supplements that promote relaxation and that usually helps with my anxiety. recently my heart has been acting this way and i've tried taking the supplements thinking its part of my anxiety but nothing changes.