Hang in there, hang in there, hang in there...

When do you get to see your pdoc next? Did pdoc leave a number for someone filling in, or did she say, "call me if there are problems"? If so, it should be OK to call. How recently was your dosage changed? The side effects may be temporary and sometimes it takes awhile for the benefits to kick in. I get headaches for weeks with Wellbutrin increases, had a whole month of incapacitating migraines going from 300mg to 450mg - but it does help me, so it's worth it.

My suggested prioritization would be 1) Get up and take care of yourself - it will help you feel better because you did at least that much. 2) Prepare for lecture (give yourself a time limit, if you can, to keep it in check) - is there anything you can do with the class that's not lecture, so you have less prep to deal with? 3) Go to the store only if you really have to; you can even just get the milk if that's all you desperately need, and save the rest for another day. 4) Leave the cleaning for when you're feeling a bit better. All PhD students neglect housecleaning. I haven't met a single one who feels like they're keeping up on everything they're "supposed" to do. I have to have guests coming over before I'm willing to do any housecleaning, and as soon as I have a higher income, I'm hiring a cleaning lady because cleaning is one of the worst possible uses of my time.

For what it's worth, you're having a completely logical and normal reaction to the situation at hand. Every PhD student, depressed or not, wants to drop out at some point - you'd be an oddball if you didn't feel that way (especially first year!) And it's probably not much comfort, but you're probably not the only one in your program struggling with depression. No one talks about these things much, though.

Is there a NAMI group on your campus? I find it really helpful to go to their support meetings on my campus. I'm the only grad student among undergrads, but I'm not the only bipolar person and it's great to have the PC-like conversations and feedback in person once in awhile. It can be so hard to have no one to talk to about the intersection of mental health problems and being a student.

When energy is low and you feel awful, I find it helps to focus only on the immediate and necessary things - one day at a time, as they say. Of course, I have a terrible time prioritizing them, and had to lean on my advisor for this quite a lot. It's really hard on a research agenda, though, so if you're able to set very tiny goals (read 1 article every other day, for example) you might be able to keep that from snowballing.