have a fit

/HH AE1 V AH0 F IH0 T/
verb
  1. 1

    To experience an epileptic seizure.

    โ€œShe needs to keep her sugar level low or she'll have a fit.โ€

  2. 2

    To become suddenly enraged.

    โ€œShe'll have a fit when she finds out a younger woman got the job she was hoping for.โ€

Source: https://en.wiktionary.org/wiki/have%20a%20fit