Is your boss nitpicking your work in specific or nitpicking other people's work too? If your boss is nitpicking your work and no one else's, can you talk to your boss about it? If that fails, try your boss' supervisor.

Some people are just micromanagers, though. Quite annoying. BUT I would start looking into finding a lower stress job elsewhere before you outright quit.

FWIW, i used to work in a research lab and my professor would always nitpick my work. She did it not to be irritating, but because she felt it could help me improve my research skills, and it did. So I guess you never know the reason for nitpicking. It could be a misunderstanding or it could be your boss being a total asshole, which is why I think it's important to talk it out ASAP.