First of all, sorry to hear about your health issues and I hope that you have a full & speedy recovery after the heart transplantation.
Insurance covers some of the costs of the testing and medicines, but not gas, food, hotel rooms if overnight stays, or lost wages from my wife taking days off. I'm not asking for donations or anything, but I do have a bitcoin address in my profile if anyone wants to help out they can
As someone who went through several surgeries and a transplantation (not heart though) 11 years ago I am very well aware of the financial burden of that whole process, especially during the recovery even if you have a solid health insurance. With that being said, I've sent some bitcoin your way. Its not much, but I hope it helps anyway as I remember how much it meant to me in my time of need.