Should I regret it? I was quite ill after the first shot (Moderna) with a racing heartbeat and shortness of breath. The second shot was not as bad.......however, I began feeling bad about 3 months later, went to the hospital and ended up having a heart catheterization. The cardiologist discovered 3 of the 4 bypasses I had 7 years ago had failed.......don't know if it had anything to do with the vaccine or not but I don't like coincidences. I'm currently getting a second opinion as the first Doctor said there wasn't much he could do about failed grafts.