Sorry you're feeling this way MatBell
I know it's easy to say that it will pass and you will feel better again, but i know what it is that you're feeling and a) it never feels that way and b) even if you know that yourself the crushing feeling that it will just come back and be there forever is overwhelmingly depressing.
However, i know all that and have been there, and right now I don't feel that way at all and haven't for a while. So it really will pass, and hopefully in time you will be able to find ways to help stop this from coming back so bad.
Take lots of care, and i hope you start to feel better very soon
X