I've been there, about 3 years I was sooo down, which was while I co-founded a company. So there was this day when I didn't show up in the office with a cheesy excuse - which was not my style at all. One of my co-founders said then a week later we wants to stop the venture. I wanted to continue but actually this was the best thing ever. I should have stopped all that crap a year ago.
Before that stupid job my situation wasn't perfect but I was getting along. This has put me back a lot, both personally and professionally.
I strongly hint you to re-think your whole situation. Maybe you can take a longer time off and spend that time alone. Also hearing that you work at a trading company, those aren't exactly the most empathizing types of people.
I assume you have the qualifications to find a new job easily, maybe not such a unique one but still.
Don't be stupid and go with the head through the wall.