よいか途方に暮れた

was at a loss as to what to do

→ 良い
phrase Rare #24,216
was at a loss as to what to do Used after a question word such as どうして, 何を, or どうしたら to express being unsure what to do, say, or choose. いいか途方に暮れた is the more conversational form.
JA: 突然質問されて、何と答えてよいか途方に暮れた。
EN: I was at a loss for what to say when I was suddenly asked a question.

彼女はどうしたらよいか途方に暮れた

She was at a loss about what to do.

彼は何と言ってよいか途方に暮れた

He was at a loss for words.

彼女は次に何を言ったらよいか途方に暮れた

She was at a loss for what to say next.

私は自分の気持ちをどう表してよいか途方に暮れた

I was at a loss for how to express my feelings.

どうしてよいか途方に暮れた

I was at a loss for what to do.