Hello,
Thanks for writing to Health Care magic, I am Dr , Muhammad Ahmad , I have read your question closely, I understand your concern and will be helping you with your health related problem.
Your symptoms DO NOT sound like that of anything related to heart problem, plus you underwent a complete checkup and no heart issues were detected so in my opinion you should not worry about heart any more.
Now coming to your active issues that is
fatigue and change of vision. Yes heart issues can cause fatigue but it CAN NOT cause change in vision, as we have already ruled out heart issues so this fatigue and change of vision is because of something else.
After a transplant the patient does take high potency immune suppressant medication which keeps you protected from heart damage , these immune suppressants have multiple side effects fatigue and damage to eyes is very common among them, you are probably suffering from those side effects.
I would advise you not to panic about the heart issues but visit your doctor to discuss about possible causes of fatigue and eye site problems other than the heart.
I hope this answered your question, If you have more queries I am happy to answer you.
Regards.
Dr.Muhammad Ahmad