hi i was diagnosed with anxiety 5 years ago and sometimes its severe. sometimes when im just watching tv my heart starts to race for no reason i also get palpitations. i had a heart holiter monitor 3 years ago and it said it was normal i just had sinus tachycarida, sometimes im scarred its going to kill me or harm me, how do i know when i should go to the hospital and ifs it normal. could it possibly change my heart rhythm or harm me? and as well as the palpitations?