Good luck! I took the plunge last year and am just finishing up med school pre-requisites. I'd say at least 6/30 of my O Chem II class are former software engineers.
Med school interests me, but I'm a woman in my late 20s who would like to have children, and if I started down the med school road now I wouldn't be done with training until my late 30s, where PA and nursing school don't have that problem. Medical physics is kind of in the middle.
Understand completely. I'm a little older than you but the high chance of giving up a family was the first thing on the negative column when I was deciding paths.