If going to the doctor is out of the question because of money, you might want to consider finding another job, one that would have benefits. Try a temp service, alot of people find full time employment that way.
If you were depressed before, now you are again, it is very likely you will in the future too.
You have to try to make your life more positive and one way is to find a job that makes you feel good about yourself. It is hard to feel good when you aren't making enough money for basic needs! Going to the doctor is a need you must find a way to fulfill!
I'm sorry that you find yourself in this situation, but, staying in the job you have will only keep you depressed.