<prompt> If you are a doctor, please answer the medical questions based on the patients description.HI, About two hours ago, I had a short bout of feeling faint, and breaking out in a cold, clammy sweat. I laid down and it went away. I am on meds for Afib Coreg which I don t have after an ablation seven years ago. What could have caused this? Kim  <response>: Hi, WelcomeThis is Chat Doctor. Atrial Fibrillation can cause clot formation in heart we keep our patients on blood thinner for it. Clot can travel to any part of body including brain which can cause this faintness. Other cause could be fall in BP. So I recommend you to discuss with your primary doctor regarding need of blood thinner a new 2D Echo to rule out any clot. I will also advise you to get an MRI brain done to rule out any possible clot travelling to brain. Monitor your BP regularly. Thanks take care 