Since I'm home (with two babies fast asleep) on new year's eve, I'll answer this.
Ya, do fafsa now...it can't hurt. The only thing you'll need to think about is when you stipulate which schools to send your SAR (student aid report) to...medical schools or your post-bacc choices. In either case (you get into med school or have to select a post-bacc) you can go to fafsa online and have your SAR sent to those schools once your circumstances are more clear.
Good luck,
Ockham