I think you've done the right thing. I work in internal PR and it's really hard sometimes when you have to defend, or sell, and aspect of the work / sector that you know is wrong and deceptive. You try and keep things separate, you start convinced that what you do during the day isn't who you are at home, but that's nonsense. Part of what makes you great and your opinions and views so compelling is your honesty and your passion. While I'm sure you could have done the job standing on your head, and I know they would have been extremely lucky to have had you, I fear it might have slowly disapeared you. And I also think it would have remained impossible for you to keep blogging in the way you do now. Keep looking, a job that is better for your health and well-being is out there, but PR it aint - it's a poisoned chalice!