Thats kinda what im feeling currently
When one purpose is lost, or ended, it is worthwhile to find another. Get out and do something productive, even if it is small, ideally something you enjoy
There is an old adage that says no matter how bad your world may seem, you need not go far to find another who has it worse.
Cherish life. Make someone else smile. Change your venue. Take in some fresh air. Your life is what you make it, or merely what you allow it to be.