Thanks for the reply KenKeith. This is the first time I have ever posted here on this website, so I am not sure what's what. You have posted several great replies to many people regarding a whole range of problems that are heart related. Is this your site or do you work for MedHelp? Or is it just several volunteer people on the site that post answers to comments and questions? Either way, I appreciated your reply as it has given me some important things to consider, specially regarding the exercise and exertion. I will be keeping a close eye on the EF for awhile and hopefully have not suffered any new permanent damage. Since this issue started with breathing problems, do you think I should get a lung xray? I did have a chest infection about one-month before my last heart episode. Did you also hear about the Digitek recall and that problem? I stopped taking it the week my breathing problem stopped?
Your post indicates there is no permanent heart muscle damage. The risk with weak heartbeats includes blood clotting within the heart, and also an insufficient amount of blood is transported to the heart beacause of weak heart beat, and thus increase the risk of embolisation and stroke, or increase in the risk of heart failure, or increase in the risk of sudden cardiac death.
Exercise does increase the strength of contractions, and there is no impairment due to heart muscle damage and that appears to be ruled out so the heart will/should get stronger. Since your myocarditis your EF as not been within the normal range (50-70%), and that issue should be resolved before risking yourself to excessive exertion. Having no shortness of breath does not rule out an unfavorable episode for heart cell damage as often damage can occur without any symptoms. I had a silent heart attack 4 years ago...no symptoms until the heart failed to pump out sufficient blood causing blood coming from the lungs to back up resulting in pulmonary edema and a trip to ER.