Possibility of expulsion has made me severely depressed. What should I do?!

Last weekend, I borrowed another student's homework and submitted it into an online grading program. (I am in college.) Normally, a student submits the work to themselves to check their homework, and then submits it to the instructor. I was tempted to cheat, but my intention was to check the other's work to see if it was correct, and then use it as a reference, while not copying it directly. The email that I got back indicated that the program had detected an identical submission. I freaked out and submitted my own work as it was, but after a long delay in my work being graded, I fear that- possibly today- my instructor will tell me that I am going to be expelled. (After a look at the syllabus, I found that it very clearly stated that what I did will not be tolerated under any circumstances.)

For days now I have been severely depressed. Though I doubt I would act on it, thoughts and dreams of suicide have entered my head. If I am expelled- perhaps even if I am suspended- I feel that I would at least have to exile myself. I have come to the discovery that without honor or achievement, I am nothing. Expulsion would take both of these things away. My parents and my friends love me, but I would only be a burden if I stayed. Not only that, but I could not bear to face the shame.

Before this, I was an honest student, loved and held in fairly high regard. This was not a downward spiral; it was a fall from a cliff.

Please help me.