[smarri]

Like others have said, I'd consider the route of doing both if you can. Medicine as the day job and CS in your spare time, over time you'll carve out a niche at the intersection of both. Both industries are obviously not going away anytime soon, so actually you'll be in a strong position.

If it's of use, I'm older than you, and studying CS in my spare time and my day job is not writing code. I'm starting to carve out a niche for myself, plus I simply enjoy building things with code.

I'd be cautious of the advice of 'doing what your heart wants', I think much better advice is do what is at the cross section of what you are good at, what people are willing to pay your for, and if possible what you enjoy.