I have a brother-in-law with a pretty textbook case of ADHD (and a more than a bit of combat related PTSD) who worked up through EMT/Paramedic to being a nurse to being basically top of the heap. He did cardiac surgery nurse for a while, then ran an ER, and these days he's doing contracts. Seems to me (as an observer) that the chaos he works with dovetails with 'effective' part of ADHD and he's very successful. Tangent: since you have some background in IT, you'll be able to handle Epic and the other EHR systems with little problem and you will be very popular amongst your coworkers.

As far as the job...things for entry/junior level in IT are frankly extremely bleak. I haven't seen an entry level job rec get approved in maybe a year. And I'm watching lots of my peers getting let go; it's a bad time to be old or young in IT. OTOH...not just my BiL but my wife is in health care, and whatever downside the job holds, 'no one is hiring' and 'they're laying off folks left and right' are absolutely not something they are worrying about.

And no matter what the downsides, no matter the lack of appreciation and compensation, you're actually helping people. That's better than most of us. Best of luck.