I think what I am feeling is depression, or that I'm surrounded by arseholes
That's a tough feeling. What makes you think it is either of those things?
I'm serious about this. I'd like to know what's going on
It's okay to wonder if you are depressed if you can't cope with everything around you.  If you think that might be the case, you should see a professional psychiatrist, who can help you get to the bottom of things.
Nah, I'm feeling better now
That's good you're perking up right now, but I believe it's still good to try to get to the root cause of your feelings. It might come back, so why not try talking it out with others to fully understand what you're feeling in order for it to never come back again?