Sadly, chocolate is out of the question. *sigh*
All I can really say about this is READ those labels and study them hard! Some fruit-flavored candies may be okay as long as they are not citrus-y. However, watch out for citric acid and/or the use of lemon juice in fruit-flavored candies.
So, may I suggest popping up some popcorn on the stove for an alternative to the Halloween festivities? Do like the Irish and sprinkle a little sugar on the popcorn for something sweet (think kettle corn). Or, toast some pumpkin seeds from Mr. Jack-O-Lantern and season with salt for something crunchy. If you are feeling really daring, a nice pumpkin mousse (sans cinnamon) with a dollop of fresh whipped cream (that way you can omit the use of vanilla) would be divine!