From Longman Dictionary of Contemporary Englishgo out of your mindgo out of your mind (also lose your mind) informalMPCRAZY to become mentally ill or very worried, bored etc SYN go crazy Nicole looked at him as if he’d gone out of his mind. → mind
Examples from the Corpus
go out of your mind• I'm with the kids all day, and I'm starting to feel like I'm losing my mind.• If I have to wait in one more line, I'm going to go out of my mind.• She said she was going out of her mind in California. 