I Am Having Increasing Nightmares About Work, Keeping Me Awake

I am having increasing nightmares about work, keeping me awake and stressed-out.
The moral at work is low, and pretty much a toxic work environment. Since I took a month off, I am beginning to feel better, and the only bad dream I had was the night I called in to speak with my manager.
Do you think it's time for me to get out of there? Find a better environment or change professions even as I am in a very high-stress career.