Mate the best thing you can do is go and see you doctor and chat about it. Do not post on a trials forum and try and expect a coherent answer to medical problems. your doctor will possibly dismis your cardiac events but maybe he would want you to pop down to your local hospital and have an ECG done some blood test and a full history. People drop dead with heart problems so its not worth messing about. As for the previos poster saying try riding erect, thats nonsense. you could have one in a number of things, ie long QT syndrome bbb a sensitive sinoatrial node foramen ovale hypertrophia but to name a few of the patholigies of the heart Smoking can have effects on heart conductivity, so best stop it if you do!! I possibly proved myself wrong by giving a semi coherent answer!