Been there, done that. Just reapply the next year but ONLY to those schools where you might have a chance. Don't apply to universities where you know you have the same chances of a tornado hitting a junk yard and forming a functioning 747 Boeing Jet. Take some master's or post bac classes to boost your GPA too.
If fifty schools rejected you, there is probably a good reason. They do ask in AADSAS if you've previously applied and if so where; I wonder if the text box is long enough to put 50 places. Not saying it's impossible to get in the next year, nothing is impossible, but .. I reiterate .. there is probably a good reason.