question: why does my heart beat fast at times but it feels like it is barely beating? and sometimes when i walk like at a regular pace it will start to pulse and i can feel it all through my finger tips....? it is almost like a shallow beat...? o yea i have had a ringing in my ears now for about half a year now and it hasnt seemed to have go away....Help!...please. i also have an arachnoid cyst in my head could this be causing any of these abnormalities?