What about Monk's Stunning Fist (Ex)?
By reading...
At 1st level, the monk gains Stunning Fist as a bonus feat [...]
At 4th level, and every 4 levels thereafter, the monk gains the ability to apply a new condition to the target of his Stunning Fist. This condition replaces stunning the target for 1 round, and a successful saving throw still negates the effect.
At 8th level, he can make the target sickened for 1 minute.
[...] These effects do not stack with themselves (a creature sickened by Stunning Fist cannot become nauseated if hit by Stunning Fist again), but additional hits do increase the duration.
By reading this, it seems there are other ways to nauseate a foe, by sickening a sickened creature