What do you do when depression interferes with your school work?

I've been on anti depressants (wellbutrin) for about 2 1/2 years.
Lately, I have hit a low and I can't get myself out of bed until noon (missing some morning classes). I don't have much motivation for school anymore. I don't want to enter the work world feeling this way, as I graduate in a few weeks. I just don't know what to do or how to get out of this low.
help?
What do you do when depression interferes with your school work?
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