It's a real thing, and it doesn't have to have schizophrenia to accompany it. My wife and her dad are both really sensitive to soft sounds. It's a real condition, but I forget the name of it... maybe it's as simple as soft sound sensitivity?

But I'm unsure of what methods they have for treating it. With my wife, I just try not to eat near her, and sometimes we need to communicate some kind of middle ground. Sometimes she'll wear headphones and listen to music, sometimes I'll leave the room... whatever we gotta do. But yea, you're not a freak or anything.