ふあん
uneasiness, anxiety
不 cancels whatever comes after it, and 安 is a woman settled under a roof. Take that away and you have the night before the hospital, awake at three. No fun ふあん: ふあん.
The 安 of 安心 あんしん with 不 in front of it, so it is precisely that peace of mind removed.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.