Hi Bri, I'll second what Katherine said. Lots of people with POTS have arrythmias, but they are usually nothing to worry about. The feeling is quite uncomfortable, though. Makes it hard to rest, sleep, or concentrate doesn't it? Do call a doctor (cardiologist or family practioner - whichever one is willing to help) and ask for a 24 hour holter monitor. It will record all of your heart beats for a day, then the tape is analyzed for anything that might be wrong. You can also ask for the report to be sent to you, and you can then read the diagnosis for yourself. Like Katherine said, it is probably nothing serious, but it will put your mind at ease. Rachel