Hi Rupert,
I can understand your fear and anxiety, as I have also experienced the panic of "What have I done"? Try to take it one step at a time....start to prepare for work tomorrow....drink lot's of water, eat a good meal, and rest. You can move forward with other steps tomorrow....email your professor, make amends with roommate ect...once you get a few days under your belt of drying out....you can make your sobriety plan.
My point is....try not to look at the whole mountain...one step at a time.
Love and forgive yourself, and start to move forward.