Okay, first you need to step back and address the depression. You need to make some changes in your life, at least for a little while until things calm down. Are you going full time to school? If so, can you switch to part time?
Or even take a whole semester off?
I got a biology degree at 28 BTW. And my MS by 33. And I've been working in science for 20 years now. Between 16 and 33 I did just about everything you can name. Well, it seemed that way. So it took me alot longer than usual to get it all sorted out. And I have suffered from depression most of my life. I just keep cleaning the kitchen, doing the laundry , and going work, inbetween wondering how and when I will die, and whether this all means anything.
I always had goals, and they kept me going. Get The Degree. No Matter How Long. No can take that away, and it's an accomplishment. I took a whole semester off in my third year because I ran out of money and worked full time. The college hooked me up with an employer for an internship. It only lasted 6 months but it was enough to refuel the bank account, and let me find out how I functioned in a REAL lab.
If the school doesn't have internships, go for a science related field. Veterinary technician is good, hospital lab work, pharmacy technician. Keep your hand in, make a few bucks.