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Jyutping fong1 cyun3 daai6 lyun6
Pinyin fāng cùn dà luàn

Definitions (粵典–words.hk)
  1. 語句
    唔​知應​該​做​乜嘢​好
    one's mind is in a turmoil; to be greatly disturbed
    • 我一見到佢喊就方寸大亂喇。
      我一见到佢喊就方寸大乱喇。
      ngo5 jat1 gin3 dou3 keoi5 haam3 zau6 fong1 cyun3 daai6 lyun6 laa3.
      Once I see her cry my mind goes into turmoil.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be agitated; to be troubled and nervous

方寸大亂 [---乱]

Jyutping
Pinyin fāng cùn dà luàn

Definitions (CC-CEDICT)
  1. (idiom) to become agitated
  2. to get worked up
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    不要让自己因为一些小事就方寸大乱了。
    不要讓自己因為一些小事就方寸大亂了。
    bù yào ràng zì jǐ yīn wèi yī xiē xiǎo shì jiù fāng cùn dà luàn le 。
    • Stop getting yourself worked up over little things.
Examples (粵典–words.hk)
  1. Cantonese
    我一见到佢喊就方寸大乱喇。
    我一見到佢喊就方寸大亂喇。
    ngo5 jat1 gin3 dou3 keoi5 haam3 zau6 fong1 cyun3 daai6 lyun6 laa3.
    • Once I see her cry my mind goes into turmoil.