My first win was baking a potato more than a month into it. Under normal circumstances I'm a good cook.
You sound depressed. Do the right thing with the employer and quit. Say you thought you could push through it, but you can't with the depression. It's not fair to make them fire you, even if you don't like it there. If you need financial support file for disability.
As soon as you possibly can, start working on something you 100% agree with. If you've always wanted to serve coffee at a cute cafe, do that. It doesn't matter how much it pays you can figure the money stuff out later. You are in full blown avoid-this-getting-any-worse mode right now.
I truly wish you the best and hope you make it through this. The day can be better again. I know how hard it is to believe this when it happens, but it is true. Do not give up.