I'm sorry you're going through such a hard time.
First of all, I'd go back to the doctor and tell them the antidepressants aren't working. There are lots of them out there, so maybe they need to try a different one. I don't have your family stresses, but also recently suffered a severe bout of depression and am slowly recovering, so I know how it feels to force yourself out of bed. However, after about 6 weeks of antidepressants, I'm feeling much brighter.
Second, there are agencies to help with depression. Can you contact them and ask if they'd recommend a counsellor/therapist who could give you a payment plan or offer free assistance?
If I were you, I would not add the stress of nursing school
to your load at the moment. Getting out and doing things you enjoy helps depression, but adding stress exacerbates it. You may be better to take this time with your family, rest and recover.
Feel free to PM me if you want to talk. Hope things improve.