out of one's head

out of one's head или out of one's mind или out of one's senses также off one's head  {adj. phr.},  {informal}

Поступающий безумно; дико безрассудный.

The patient was feverish and out of his head and had to be watched.

Her friends thought she was out of her mind to marry that man.

Ср.: OFF ONE'S ROCKER. Прот.: COME TO ONE'S SENSES.