Well, sticking with it until you find something new is a positive since it shows you're willing to put in the work, BUT do not do so at the expense of your health. It's okay to quit early if you can afford to and can't afford not to. Don't look loyal if it's killing your life.

As for "spin," something like learning what you dislike in a position or company, or how your current position has reinforced your passion for the position you're applying to - things with intent between the lines are fine. Avoid saying anything like "I needed the money" or "that place sucks so bad."

Above all, learn from this (of course). Was anything weird during the interview and hiring process that you can see in retrospect was suspicious or misleading? If they had said one extra sentence in the job description, would it have tipped you off that the role was a bad fit? Is it really the job or is it the people that are a bad fit?