Source: The Great Interpretation of Dreams (Ibn Sirin)
Fainting in a dream indicates worry, grief, and severe illness afflicting the dreamer.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Fainting indicates repentance and returning to God after heedlessness.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Fainting is interpreted as worry. Whoever sees himself fainting will be afflicted with worry.