hys‧ter‧ics [plural] spoken
when you are unable to control your behaviour or emotions because you are very upset, afraid, excited etc:
She went into hysterics when she heard about her husband.
have hysterics (=be extremely upset or angry) British English
Mum'd have hysterics if she knew what you'd done.
if someone is in hysterics, they are laughing and not able to stop:
The audience was in hysterics.