Frank, I'm pretty concerned about you now that I hear you say you rarely eat and have lost a lot of weight. You are malnourished so it's no wonder you feel so low emotionally and spiritually. I hope to God you are taking a potent daily multivitamin at least. A low vitamin D level will make you REALLY depressed. Spend time out in the sunshine. Another great source of V-D. (Oh no! VD.)
Seriously though, merely not drinking isn't going to fix all that ails you. You need to replenish all that your body was deprived of while drinking all those years. Please do something to help in that way. Ensures, Boost, etc. And a really good multivitamin, but not on a totally empty stomach.
It will do far more for your mood than any antidepressant. Please take care of yourself.