i've found myself feeling the same way before..... seems to come and go but i have noticed that it DOES PASS.... i do what i know to do, which for me is talk about it or read something inspirational, exercise.....something i know is for me...or help someone else out....give someone a call, text, email....getting out of my own head....
not sure if you like to read but perhaps you could ask around for helpful literature to look at.
hang in there. hard as it is to hear, pain is opportunity for growth