I have been having alot of stress lately and also trying to get over this kill cold. I have been taking tylenol allergy and sinus each day, the liquid, but haven't gone over the directed amount. Now I am having a slightly irregular heart beat, like, 1, 2, 345, 6, 7, 8, 91011, 12, 13. Something like that. It's kind of scary but isn't producing any symptoms like tired, dizzy, nothing. Should I worry? The heartbeat thing has been going on for about a day, the cold is almost gone now so I stopped with the meds. Thanks, Matthew