To become overwrought or unnecessarily upset over a trivial matter.
lose one's cool
To become upset or disconcerted; to lose one's temper.
throw a fit
To become angry, enraged, or upset; to act or react with an outburst, …
turn turtle
To become upset.
get bent out of shape
To take offense; to become angry, agitated, or upset.
get one's bowels in an uproar
to become upset
scream loudest
To complain or speak up with more intensity than others, especially in…