We found one dictionary that defines the word one's heart in one's throat:

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1. one's heart in one's throat: Wiktionary

Definitions from Wiktionary (one's heart in one's throat) ▸ noun:  Synonym of one's heart in one's mouth ▸ Words similar to one's heart in one's throat ▸ Usage examples for one's heart in one's throat ▸ Idioms related to one's heart in one's throat ▸ Wikipedia articles (New!) ▸ Words that often appear near one's heart in one's throat ▸ Rhymes of one's heart in one's throat ▸ Invented words related to one's heart in one's throat