What to do if you hate your job?

I have been working professionally for close to 10 years in seven companies (not counting part-time job or internships). Disclaimer: I am no workplace expert. I am an average cog in the wheel who reads and thinks a lot on the subject (and perhaps have been through a few of the not so great workplaces myself). This might or might not be a writing therapy reflecting on my worklife over the years and most recently.