Does unintentional vomiting break the fast and necessitate making up the day, and what is required of one who experienced this two years ago and only recently learned of the ruling?

Vomiting for a fasting person invalidates the fast and requires making up the day if it was done intentionally. However, if a person is overcome by vomiting and it occurs involuntarily, the fast remains valid and does not require making up the day. The proof for this is the Prophet's (peace and blessings be upon him) saying: "Whoever is overcome by vomiting does not have to make up the fast, but whoever vomits intentionally must make up the fast."