I think the first thing I would do is try to make a support system on or near campus. Find a T, and if necessary, a Pdoc. Next, I would also investigate what my previous school referred to as the Mental Disabilities Center. There I had a caseworker that worked with me to determine if I needed accommodations, would write letters to my professors alerting them to my accommodations, and would meet with me every so often throughout the semester to see how I was doing.

Next, once you actually get back on campus and start classes, talk to your professors from the very beginning. If they know you, and realize that you are working on keeping your depression under control (therapy, medications if necessary, etc.), then they'll be more understanding if you do start slipping. It's harder for professors to be understanding when some random student who seemed to be doing fine comes up to them and tell them they're depressed and can't do the work.

In the meantime, can you take any of your courses on line? What helped me was getting a part time job, proving to myself that I could hold on to it, take on responsibilities and commitments, while working through my depression and anxiety. I'm also planning on returning (hopefully, if accepted) next semester, but only part time. Take baby steps; if you bite off more than you can chew, you could end up stressing yourself out and sending yourself back into a depression. Build a strong support system, open lines of communication, and take baby steps to getting back to where you want to be.

Good luck!!