go to one's head “（成功、权力等）使某人过于骄傲，冲昏头脑，使某人飘飘然”

【例句】
Never let success go to your head.
不要让成功冲昏头脑。

Little to no power has really gone to your head.
这屁点般的权力真把你冲昏了头。