Shawn,
You could be writing for me as well. I used to work for a similar employer, and had similar issues with management. Those issues led me to leave, but I remained in the same retirement system. I’m also at a similar age, with somewhat similar financial circumstances, and facing similar desires and choices.
Personally, I intend to work the remaining few years, for one so as not to lose the health benefits, etc., of the retirement system. I recognize that the shine of those benefits is being tarnished, but they are especially valuable to an early retiree (e.g., age 50). From what I hear of your situation, I would suggest that you relax and take it easier at work, try not to take things personally as much, make a few more contributions to society via work, and generally do what it takes to make it through the last few years to 50 with your head held high.
I would also encourage you to think about taking some time off. A years leave of absence, for example, would likely do wonders. Since you are thinking about cutting the cord now anyway, there's no down-side to an extended LOA. Just think of what you could do...
Cheers.