Hi Candybear,
I have been reading your posts about the job and I feel for you. I've been in jobs like that myself. Once the negative vibes get into an office, everyone suffers, and it's hard to cope with the atmosphere if you're a sensitive person.
It sounds like your anxiety is mostly situational, and the situation is your office! The way you describe the feeling of walking into the office is so clear, I feel like it's me going in there with you.
Maybe, next time you go in, you actually could imagine that we are with you, sharing the hard feelings, and helping out.
I hope things get better for you soon.
Good luck, Myzen,