Here is a short passage from my reading this morning:
We must not judge of ourselves always according to present feeling, for in temptations we shall see nothing but smoke of distrustful thoughts. Fire may be raked up in the ashes, though not seen. Life in the winter is hid in the root.
When all you see and feel is bleak and hopeless, do not trust what you see and feel. Do not trust your reasoning.
It sounds trite to say this, I know, but: Hang in there (somehow) and believe (even if you cannot feel) that God loves you and Christ died for you.
Also: Get some help.