I've dealt with extreme boredom and dissatisfaction and changed professions (albeit from software to information security) and after years I am again facing the same issues. I feel like there may be deeper problems here. In retrospect, while a career change hasn't damaged my career prospects, (on the contrary, it seems like I am probably more employable) I certainly don't have as much experience in either field as I would have if I had just stuck to one (although, through diligence, I have kept on top of my software skills, at least in my particular set of niches). As such, I can't necessarily recommend pursuing this type of solution to your particular problem (although medicine definitely seems distinctly different to tech so maybe it WILL solve the problem).

I guess what I'm trying to say is, maybe consider other options such as trying to completely understand the root cause for your dissatisfaction and extreme boredom. Believe me, I know this isn't easy, but at this point I am at a loss for other options and feel like I must figure out exactly what causes me to feel like this in order to avoid having this happen a third time.