I know if you shaken some one when they are already shaken they become frightened. Is the same true with (dazzled to fascinated)(sickened to nauseated) (dazed to stuned)
From the PRD glossary: On fear: "Becoming Even More Fearful: Fear effects are cumulative. A shaken character who is made shaken again becomes frightened, and a shaken character who is made frightened becomes panicked instead. A frightened character who is made shaken or frightened becomes panicked instead."
There is no such language for dazzle/fascination or sickened/nauseous.