Sorry this personal question, but what kind of heart problems you have had?
I also have had some problems with my heart. I have premature heart beats (extrasystolia) for time to time. They are checked and everyting should be allright. They are very common in athlets. Itīs a irritating but not a dangerous problem.
Here is some research fot the subject.
http://www.aafp.org/afp/20030101/tips/4.html
I do not have my medical certificate yet. Letīs see what my doctor says.