I had this issue; I eventually went to my GP to discuss things, ended up breaking down in tears before I could even start my calm pre-rehearsed speech about it. I got signed off for 2 weeks, I went in after 1 week and gave in my 1 week notice because I realised the job just wasn't healthy for me to be in.
I'm not saying this is something you should just do flippantly but if on reflection you find that it's affecting your ability to function in life then, I would highly suggest looking into alternatives and giving your notice.