Unfortunately, recovery from the heart operation has not gone as well as I had hoped.
I've been getting really bad arrhythmias (i.e. rapid and irregular heart beats). In fact, I have been feeling worse than what I was feeling prior to the heart procedure.
Evidently, these recurrent episodes do not necessarily mean that the procedure has failed, as it is not uncommon to get arrhythmias while the heart is still recovering.
Nevertheless, the persistent and abnormal heart beats have been extremely unpleasant. They are also very scary. After 3 days of putting up with my heart racing at 140 beats per minute, I decided to go to hospital, where they performed a cardioversion to basically stop and restart the heart. It worked for a few hours and then the heart started going crazy again.
Looks like I'm going to have to just deal with it and hope that the irregularities will settle down.