I am in this situation right now. I will be able to get ~$10000 over the year beginning this summer (including fall and spring). After that, there is no more federal aid. As I have a Psycology degree and CANNOT find decent work with decent pay, I will likely have to take out additiopnal loans from a private source (such as CITI or BOA). The interest rates don't seem too bad, but I already have 2 loan payments and adding a third could make things substantially more difficult during residency (eg-not having enough money to cover expenses and make payments... what good will a lousy 40k be?!?!)
Uniformed services are an option for medical school, but I don't think military life is for me (though the financial situation would be so much better, I may actually consider it).
Good luck.