Hang in there.
I, too, suffered for a long time with depression and only recently got some relief. It came with another change in meds and I didn't have much hope since none of the others worked but this one did and now the depression has lifted. I still have bad days but it's so much better. You just never know what a difference the next thing you try might make. Don't give up. They are coming up with new medications everyday.
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Bipolar I, Depression, GAD Meds: Zoloft, Zyprexa, Ritalin
"Each morning we are born again. What we do today is what matters most." -Buddha