Been experiencing heart palpitations at different set of time with a list of variety like throbbing after had dinner/lunch or heart beating faster which is like I run up for 800 mtrs for 7 days. My BP is normal and pulse is in btwn 79-96, keeps on flactuating. I have to breath faster and sit down if I use stairs. Recently I have had an extreme mental pressure for deteriorating  health condition of my family members. While throbbing, if I stop breathing in, throbing stops. Is it something dangerous which have been with me? I shall be highly grateful to you who's gonna reply me.. thanks a lot!