Depending where you work, is there an option to transfer to another location doing exactly what you do so you do not have to be with your manager or is it the job itself that upsets you as well?
I always say find a new job before quitting somewhere because at least it’s money and if it’s a while you don’t want to get stuck, but if you’re applying and it’s really affecting you I may just quit.
It’s better for your mental health and at least you’ve taken the initiative to look elsewhere and hopefully something will come along. If you’re applying online, go in person to places and talk to people to possibly get the ball rolling faster