OH WOW! I don't know what to say! If there were any way, any way at all to negotiate some kind of recovery program as you finish your degree, gosh I hope you could do that. You are so very, very close to graduating and that is a huge admirable accomplishment, and there are the very practical and real concerns as well as to the consequences. Have you made out a pro and con list? I think doorknob has allready said best what I would attempt to say. I really hope you can find some viable options to realize both your dreams, sobriety and the degree you have invested yourself in. Both are valuable foundations for your entire future.
Gulp! All I can think of is the "Just for Today" approach.
I am sure others will have better information, but I so empathize with this situation. It strikes near to home with me on a couple of fronts.
hugs, love, best wishes, tons of good vibes,
live