I think that depression with insomnia and
suicidal ruminations is the primary issue, and
not dependence on vicoden. I think you should resume vicoden, and taper gradually. If you feel that zoloft was effective, then an increase is probably a better bet than switching to another. If your insomnia is not relieved, I would think about trazodone, amitriptyline, mirtazepine or nefazodone to help with the sleep.