Hi to everyone sorry that my story is going to be a bit long . I have been to the hospital numerous times thinking i was having heart issues . They performed a battery of test . They can not find any issues with my heart . All test are totally normal . Fot the past year my heart would suddenly race for no reason and i would have heart palpitations . But this new feeling i am getting is far worse . For the past few days . I keep getting this startled feeling . I can get it from anything like a low noise on tv . I will be watching tv all the sudden i feel startled its like a palpitation without me being actually startled . I apologize for the duration of my post . If anyone has any info please share .