go to your head
if someone lets success go to their head, they start to think that they are better or cleverer than other people, and they begin to behave in an arrogant or silly way
Ford is definitely not a man to let a little success go to his head. He knows he still has a lot to learn.
if alcohol goes to your head, it makes you slightly drunk and perhaps affects your judgement so that you do silly things
He was not accustomed to strong liquor and it went to his head.
Easy Learning Idioms Dictionary. Copyright © HarperCollins Publishers