I'm assuming you don't live in the United States since you say you don't qualify for any other kind of work. That's really tough & a hard thing for most of us to imagine. Continuing to talk to your doctor about other meds & therapies that you can try is a good idea.
Other than that, I think about the only option is to try denial. Believe that the customers who are calling you are really, truly good people who are telling you the truth about their situation. Say out loud that you like your customers several times a day. I know that sounds crazy but my first job I was contracted for a year & a few months into it I was terribly depressed. I started sending out resumes to other organizations, doing the same kind of work but with different people -- which can make a big difference. Neurolinguistic research shows that when we say something, even if we don't believe it, it starts to change our thought process. By saying that I really liked my customers (I called them my "little angels" -- started out sarcastic, but eventually I could say it with a straight face), I began to change how I felt about my job. It still really wasn't the job for me, but I didn't hate my customers or dread going to work every day.
I'm not sure what kind of work you want to do, but there are private scholarship foundations around the world. One of those is The Rotary Foundation. The provide study abroad scholarships for students who have completed at least 2 years of undergraduate study (in any field) prior to their scholarship year -- they take applications 12-18 months ahead of time. Those scholarships tend to be for humanities -- medicine, peace studies, early childhood education, water & sanitation. They are one of the largest private scholarship foundations, but there are other options as well. Perhaps you can find a private scholarship that will allow you to train for a different field. But that is for the long term. For now, it is a matter of believing that your job is good, your customers are good, your co-workers are good -- until you can find another workplace, another field, or whatever other change may be required to help you feel happy and fulfilled at work. I agree with Karen that, based on personal experience, giving into the depression & staying home only gets worse with time. The longer you stay home, the harder it is to get motivated to go back to work. I got to the point where I was so terrified that I didn't even want to go to the town I worked in, then I didn't want to go to the next closest town, then I started ordering my groceries for delivery because I didn't want to leave my home, then I didn't want to go down to get my mail or do laundry, and finally I couldn't bring myself to leave my bedroom. At the end of the day, I lost that job I hated & that brought me into a deeper depression. It took me months to find other work & that was even worse -- the pay was a lot less, it had no benefits & the boss was totally psycho. Things are turning around now, but I would never make those choices again b/c they snowball too quickly. I would get out of bed & get dressed & go to work no matter how I felt about it.
I would post my dreams on my refrigerator so I remembered what I am working toward 5 years from now. I would focus on the positive & if there wasn't anything positive, I would make something up. I would do that job to the best of my ability, knowing that doing so would prepare me better for the next job I hold. And it would buy me some more time & money to try to get back in school to train for something else, rather than landing me unemployed & penniless, scrimping to buy food, never mind trying to pay for school or training. Please don't be as short-sighted as I was. Go to work if for no other reason than to make sure you can set yourself up for another, better job.
Hope that helps!