Context: my workplace is pretty stressful, with lots of people trying to climb the corporate ladder. Coworkers don't really get along as our organisation underwent a merger some time back, so the work culture is really messy. There's a lot of Us vs Them and the boss has her own clique, which she takes care of. (e.g: covering and granting off days more permissively while riding anyone else) People are on edge a lot, they yell at each other. People are always busy. I stay on as my contract is not up yet and the money is stable.

I recently had my performance review. One big area for improvement that was highlighted to me was that I need to manage my stress and mask my emotions better. Specific instances raised: I looked stressed when asking where another manager sat. People ask if I'm ok because I'm stressed. I look like I'm rushing around.

This is an office where fully grown adults shout at each other or are causally rude to each other.

I don't disagree that I am stressed but I don't think I'm handling it any worse than people who are sleeping at their desks or raising their voices. 

I'm on vacation now and I get intrusive thoughts 7-10 times a day about work. It's really bugging me. Any input or advice would be appreciated, thanks.