I have read other member's asking the same question and seeing that alot of people do get it for depression. From my understanding it can be a fight,and take awhile.
I also have seen many members stating that you should get a lawyer that deals with SSDI right away.
Are you in the US? If so here is some links that I found for you.Also you will probably qualify for legal aid in your state. If you just google "Legal Aid and put your state in" then you will have the numbers.www.social-security-disability-claims.org/www.socialsecurityhome.com/
Good luck and keep us posted.