I'm a grad student too. I am totally in the same boat. I definitely can't afford in patient now financially or any other way. I understand it feels overwhelming and impossible.
Living with all this I start to wonder so when do I get to have a semi-normal life with semi-normal problems like dating and getting projects completed?
For instance, Today I had a very serious mental episode and feel like weeping forever because my two closest people, my sister and best friend, are both MIA and I really need to talk. Then I feel ashamed that I rely on them so much that apparently I can't keep myself together when they are both busy. I feel a total angry, sad wreck. Oh I have two class assignments to finish tonight, due one tonight and one tomorrow.
It feels awful sometimes.