Just breath!
Take a deep breath, stop for few seconds and think about the things what hurts you so much. And then breath out. Repeat that a few times. And then think about everything what makes you happy and what you want to do to live on.

With each exhale, you blow out the bad thoughts and replace it with happy thoughts.
It's like the air. We breathe out old, unusable air and breathe in fresh vital air.
And Everytime when you feel bad, breath!
This is what people do best.