One last bit of encouragement about learing the medical stuff.
I was recently told at the museum, that they can teach people the history they need to know, but they can't teach the people skills and the enthusiasm for the job. So they'd rather find people that are outgoing and enthusiastic and teach them the material than have someone who knows the material, but has the personality of a limp dish rag.
So just know that a lot of times employers know the right person for the job may not have "all" the knowledge, but that they can teach it to them, but they can't teach them the qualities that they probably hired them for. And I'm sure that applies to you too. You had the qualities they were looking for and they can teach you the medical stuff.