I'm pretty sure most people go through their work week waiting for the weekend. That's how it is at jobs you hate. Unless you have something to enjoy after work (be it a hobby or a partner or whatever) you aren't going to enjoy days you work. Even then, you'll be going to work and watching the clock all day. So you won't get fulfillment out of your work but you can at least get it from a hobby or something. Still, you should definitely change careers if your work makes you feel this bad. Or at least, take less hours and get part time somewhere else to at least spend less time at your current work.