I'm sorry you are having such a rough time at life right now
Life sometimes throws crazy curve balls, eh? I've been through my fair share as well.. still am!
Unfortunately I don't have much in the way of encouragement... I don't have any experience with Fibro- It's sounds awful though. But congrats on your weightloss so far, as well as quiting smoking (It's next on my to-do list)
What Country/or State do you live in? Being a student and not having income could qualify you for State assistance as well as medical care. Also, if you live near a city- many have clinics that use sliding scale payment options- if you have no money, you pay no money.
As for disability- I guess having Fibro doesn't qualify? I dunno. But I believe depression does. I dont know if you are saying you are depressed as in, you have the actual condition, or if you are just feeling bummed because of life's circumstances...... I believe disability covers depression if it affects the person's ability to function in normal day to day activities- which of course, has to be noted by a doctor, etc.
Meh, I'm just throwing things out there. I hope things turn around for you though!