get one's knickers in a twist
Pronunciation:
/ˈɡɛt wʌnz ˈnɪkəz ɪn ə ˈtwɪst//ˈɡɛt wʌnz ˈnɪkɚz ɪn ə ˈtwɪst/verb
Definitions
To become overwrought or unnecessarily upset over a trivial matter.