A doctor thinks he detected afib in me the other day while at a routine appointment. I was having an irregular heartbeat which is something that I've had often for the past several years along with diziness, fainting, weakness in my limbs, etc. (since contracting Lyme). I was referred to a cardiologist. What will the cardiologist do at the appointment? I have no info about what to expect. I'm in my mid 20's, female, slightly underweight and no history of smoking, drinking or poor diet.