The correct scholarly view is that masturbation is haram. But masturbation at night in Ramadan does not invalidate your fast, either on the day before or the day after.

Deliberate vomiting invalidates fasting, while unintentional vomiting does not. If vomit is swallowed accidentally, the fast remains valid. However, inducing vomiting or swallowing vomit deliberately requires making up the fast.