I think you and I are living parallel lives.. I recently moved (and had a baby), and last summer I had a stroke (actually 2). After what felt like 1,000,000,000 tests it turned out that I have a calcified heart valve that will need to be replaced at some point. I had to give up playing hockey (can't take a hit to my chest because of the valve), so I got back in to biking to keep me active. No surgeries for the heart yet, my last surgery was the previous summer for a fractured testicle.. yes it's possible to do that, long story but a hockey puck was involved lol..
So get out there and ride when ever you can, it's worth it just for the laughs and shit talk haha.