Have you tried seeing a doctor or therapist? I have the same feelings as you and I'm giving SSRIs another go. There's a difference between hating your job without being able to cope and hating your job while being able to cope. Have you considered that you're depressed? Are you able to enjoy things and be productive outside of work or do you feel the same way you do as when you're at work?
It can be a hard road to travel and there might not be a single good answer (only multiple possible answers with varying probabilities).