What a shame to read about your heart. But, maybe you can find activities that are not so demanding. My situation is somewhat similar, but I feed off those travels and experiences, almost all of my blogging is writing a lot of fiction. Although recently I've had a hard time finding the time to write comfortably.

In my 30's I have also noticed how my body has changed and I think it is a crucial time to prepare for the future, avoid diseases, eat healthily, sleep well so that the 40's do not hit so much jajaj and so the 50's...