Extreme Mood Swings: Sudden Depressive Episode: My Experience

Low episode....if you can call it that. I don't know how to describe it. It came over all of a sudden, out of the blue like a dark cloud on a sunny day. Suddenly I want to be dead, to sleep, to feel nothing. I feel nothing, but a painful kind of nothing, not sadness, this isn't sadness. This is something more.
It is the BLACK DOG. It is depression. It is a depressive episode. I don't know how long it will last, hopefully a few hours, not days, not weeks, or months, or years.
I am stuck in treacle, I can't move, even typing these words is too much. The light is too bright. I want to be in the dark in a fetal position, under a blanket, warm, away from the world.
What do I do? Do I give in to the demon telling me I am pathetic and better off dead and find a way, in this safe, restricted envrionment, to kill myself? Do I go to sleep? Do I take a sedative? Do I read a book, but how do I read when words don't make sense and they just move around in order. Do I listen to music? But sad songs make me cry and happy songs annoy me.
Do I lie on my bed staring into thin air and let the feeling pass?
Chocolate. Books. Dogs. Music. Things I love. Right now, chocolate is poison, books are annoying, dogs are ugly and music is too loud, too stimulating.
I will have to ride the wave....an emotion can only last for so long, so I have been told, so I will ride the wave....it is at it's peak, but it will dip, it will come crashing down, back to the shore.
I will wash up on the sand and the sun will shine again and life will be worth living.
These are the days, the hours, the moments, that are so fatal. These are the suicidal episodes. But I won't let them win, I won't become a statistic, a sad news story, a corpse in a coffin, I will stay alive. All good things come to an end but all bad things do too.
If it's not OK, it's not the end.
I will fight this beast, this slug, this black dog, this demonic monster.
Tomorrow I'll be on top of the world.