Job burnout (vent)

I am too stressed to sleep. I hate my job. New requirements are given last min and I'm supposed to meet them. I'm expected to work out of hours but I'm already doing so for no extra pay to meet the basic targets because I can't focus during our mandated 4 days in the office or between meetings and sudden requirements. I am getting paid below market rate to do more and more work each month. I have no energy to shower or eat or to relax to sleep. I haven't slept a wink because I'm so stressed. I literally have to drug myself to sleep and even that doesn't work because I wake up from stress and fear. I already know I'm in the wrong line of work because I am not using my best talents here but I have no time or energy to study something else and I can't afford to work part time because I have no safety net.