First, I think trying to find a way to talk to your pdoc or T, or to find something you can afford, should be a priority. This is an ongoing illness that does need to be actively treated at times, and it sounds as if this is one of those times.

Classically, sleeping is not only a really bad symptom of depression, but it also worsens the depression. If you can find ways to stay out of bed past your regular 8 hours (or however many hours you normally sleep) it may help with the depression.

Also if you can have a visit with your primary doc to make sure the sleeping isn't due to something physical, like maybe you picked up a bug or something. If that turns out to be the case, you can treat that directly and hopefully feel better overall.

Also if you could talk to someone, maybe even contact a sleep clinic, to make sure it isn't just the shift changes that are causing the upset to your sleep patterns. Changing shifts can be rough on anyone's sleep habits (it is really unnatural) and maybe (and I'm just guessing) that combined with depression the effects are worse. As in the shift change disturbs your sleep, the disturbance in sleep triggers depression, and it runs into a bad cycle.

If that is the case you may need to find a way to cope better with the shift changes taking into account your depression.

Good luck!