According to Osho, intense sensations like nausea, stomach hammering, or unease when the commune is discussed signal a psychosomatic purge: body and soul releasing social conditioning together. The navel (hara) bridges soma and psyche; when deep layers prepare to 'vomit' imposed taboos and fears, the stomach reacts. This cleansing readies you for innocence, authenticity, and real sannyas.
Those strong belly feelings mean your body and mind are cleaning out old, forced beliefs so you can feel fresh and real.