Mikester,
I've been feeling that too for some time. Started being really negative, angry, difficult. About a month ago, one of my mentors who noticed my downward spiral over the last 6 or so months gave me the book, "The Energy Bus"
The Energy Bus: 10 Rules to Fuel Your Life, Work, and Team with Positive Energy | by Jon Gordon
It's an easy read and entertaining, and I was able to relate to the story very easily. It really made me think about what was going on and how to improve my situation.
I still generally dislike my job, but I've applied several of the principles from the book, set some new goals, and I'm smiling and finding things to enjoy at work now.
Your results may vary, but I'm incredibly thankful that my mentor gave me this book and I found the book to be very helpful in helping me find a way to enjoy things more.