I've had these off and on long time.latley its been only when I do something.i can feel in my chest,or I can feel my pulse it skips,freaky..i read online about it,says its normal..not everytime I move.i do drink coffey,pop.today been up since 3am I hardly drank any,but did have 4 cups 3 diet pops..i also smoke..also under stress,i take Xanax for nerves other meds blood thinners,symbacort,nexium,randine,ventloin, making me kinda nerves to feel it when your walking across the room..now before now it was the oppsite I would be walking or whatever wouldn't feel it till I sat down..i was on steroids for my copd,i noticed it then,plus they were burring my stomach..i notice it seems more when my acid in my stomach is bad.i have barrets with a hiatail hernia fun..sorry about the grammer...any input will help,thanks