go to someone's head

verb3

1. •
   To strongly affect a person, especially to the detriment of his or her senses or mental faculties.
2. •
   To greatly raise one's conception of their social status or accomplishments.

   • He caught the biggest fish on record and it really went to his head.
3. •
   To cloud one's thinking, as do alcohol and many drugs.

   • That one glass has gone to my head, that is, touched my brain; slightly, to be sure, but enough to weaken my will. — 1886