Stay: If your boss's behavior is making you physically sick, changing jobs is not the answer. Know your rights, and protect your status, sanity and paycheck. On the other hand, if your issue is a personality clash, bear in mind you might make your boss sick, too. Be the one to suck it up.
Leave: Strained relationships at work hurt the people involved and lead to downtime and waste. If your boss becomes “passive aggressive,” your career could be stalled or even ruined if you’re not careful. If you cannot document a case of misconduct when push comes to shove, you’ll be the one shoved aside and pushed out of a job. Be proactive and get a new boss or a new job.