Quit. fukk it, as long as you have enough funds to sustain yourself for at least six months, don't keep yourself in an envirinment that puts such a strain on your mind-state.
Cool out for a few weeks to rebuild your positivity, have fun, party, read, watch movies, but also use that time to think about a career you could pursue that will make you happy. Focus on a skill that you're particularly good at and start your own trade perhaps? After those 3-4 weeks, focus 70% of your time to seeking that ideal job or building your own job and the other 30% doing whatever makes you happy as to not let the pressure of job-life get on top of you before you even start working again.