What the hell am I doing with my life? What do I do?

I'm 26 years old, got diagnosed with MDD, SAD, and ADHD a few years back and I have no clue what I am doing with my life or what to even do with my life right now. I live with my girlfriend who works long hours while I sit at home depressed, unable to get out of bed, sleeping most of the day. I feel like I am unable to do anything. I flunked out of college due to depression so even if I was able to hold a job I am woefully unqualified and I just don't know what I am doing anymore. I just sit and wait for my girlfriend (who I love dearly) to come home. Most days I try to clean a bit before she gets home but that's about it.

That's my life. I don't know what to do. I can't deal with this much longer. I don't return calls or texts from my parents. I have no friends aside from my girlfriend. Every now and then I will get the idea that maybe I can work and I look up jobs and I just see that I really can't do anything. Both in what I am capable of professionally and personally in terms of myself. I just am lost.

Please help.