<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, Ive been experiencing some weight gain lately, and Ive noticed that my heart beats irregularly. Sometimes it feels like its skipping a beat, and Ive also been having shortness of breath and have even fainted a couple of times.  <response>: Based on what youve told me, it sounds like you may be experiencing heart block. This condition happens when the electrical signals that control your heartbeat dont travel correctly through your heart, causing it to beat too slowly or with an irregular rhythm. Well need to do some tests to confirm this diagnosis, but its important to start treatment as soon as possible to avoid any complications. 