I had a similar evening. I was pretty down late last night. I know some of the reason, my family. All I can say is, never lose all hope. Know that losing hope is part of the disease of depression, and may not reflect reality. Know that there ARE people who do understand, and have oodles of compassion for you (all of us here). And just do the best you can. That's all you can do. Lean on compassionate caring people to get you through the rough times. And savor the good times.
I hope you cheer up. I've been there so many times that I can't even count.