Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Vomiting in a dream indicates repentance and returning trusts. Whoever vomits easily has repented willingly. Whoever vomits with difficulty has repented under duress. Vomiting blood indicates repentance from unlawful money.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Vomiting indicates revealing secrets. Whoever sees himself vomit is returning a deposit to its owner. For the sick, vomiting is healing.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Vomiting is interpreted as repentance and salvation from worry. Whoever sees himself vomit food is giving a gift.