Wow, and GW ain't cheap. Sorry that you're in that situation. Do you know about all of the options that could help you with paying back loans? Not sure what you're thinking you might go into, but there are basically three options that I know of to get help with your loans during or after med school:
1) Join one of the armed services and get a
health professions scholarship. The military will pay for your tuition/fees and offset your living expenses, though in return you'll have to serve for several years. May not be a good option unless you were thinking of joining the military anyway.
2) Go into primary care and work in an underserved area through the
National Health Services Corps. This doesn't offset your loans during medical school, but would help pay them back afterward. Well worth looking into if you're planning on a primary care career.
3) Go into research and get loan help from the NIH's
Loan Repayment Program. Again, this won't offset your loans during medical school, but it would help you pay them back afterward.
Hope this info is helpful, and best of luck with school.