Sounds like a miserable situation. Sometimes that can be an opportunity for growth, as one learns to deal with challenging people in a challenging environment. Because I threw in the towel way too easily, when I was real young, I went to the other extreme, as I got older, and persevered in some situations that I should have just got out of. So I'ld advize that you not make that mistake.

You know yourself. If there's little likelihood of this scenario improving, then you may want to pck it in. I trying forcing myself to stay in some bad job situations, only to snap and walk out the door after a complete meltdown. I found that I felt better when I left on job calmly. So if there's little hope of things improving, you might want to give notice and leave before you snap and lose composure. Sometimes it feels right to go off at someone who's tormenting you. But, having given this person an uncensored piece of your mind, consider next making an orderly, calm exit: writing the letter, giving notice and leaving based on a calm decision, rather than in a storm of fury. I mean the latter way is appropriate sometimes, and I've done it. But you can have 3 options: keep persevering and stay, leave when you explode, or make the planned termination on a day of your chosing.

You might ask yourself how long you've tried to make this work. If you've been employed here a few years and you feel this miserable, what's the likelihood that it will change?