You need to do a few things:
- Distraction therapy--do things that distract you from wallowing in misery.
- Health--get more sleep, eat better, and get exercise.
- Take mood-boosting supplements, including B complex, vitamin D, and vitamin C, and take them at higher than recommended doses, but raise the dosage gradually, and use capsules or gel caps, not tablets. Tablets don't fully dissolve, and end up getting flushed down the toilet.
- See a therapist or psych doc if the above remedies don't help.
Hope my suggestions help you, they've helped me. 
_________________
If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau