I used to teach high school math. I believe that, although you may be better at art, you do have a brain for math. A lot of people think they could never really understand math because of the misuse of a lot of weird left-brain/right-brain multiple intelligences theory. I've tutored a lot of people who didn't think they had math brains and most of them turned out to have a real talent for math.
It turns out that those people who can really understand math at a deep level usually don't do as well with the current math curriculums (rote, rote, rote). It's just taught for a lot of memorization, but this can get people into trouble if they don't understand on a deeper level. For example, if you're really good at math because you've memorized the steps for each kind of problem and you just mix up and get a 2.75milliters of medicine when it should be 0.275milliliters, it might not leap out at you - unless you understand what you're doing.
Recommendation: tackle the math review before the program starts by getting the medical math
book the other poster recommended. There shouldn't be any other class distractions when learning math (ideally). Math usually takes a backseat for some reason.
Offer: I love to tutor math. If you want to get together in chat or over the phone on some regular basis, I'm up for it.
Also, if you didn't have any trouble with Algebra, then no worries!