Hi,
It sounds like he had a reaction to the food, whether or not it's an allergy or an intolerance though is hard to distinguish. With the diaper rash is it a ring around his anus? Usually that's an indicator of an allergic reaction. I would definitely wait a few months before introducing that food again.
Regarding your allergies. Yes, it would make DS a bit more prone to allergies. However, not necessarily the ones that you are allergic to. Just to food in general, if that makes sense. So I wouldn't hold back on things that you are allergic to (with the exception of the peanuts - wait until after a year at least, or whenever your dr recommends), but just be very cautious with each new food introduction.
HTH!