[ Men's Health ] Open Question : Why is my husband being bothered by odors he has never been bothered by?

I first noticed when the smell of a fast food restaurant he likes bothered him. Later my perfume that he LOVES when I where became to strong and nauseated. Oh and for some reason he could smell my brothers breath from far away. It happened out of no where he even thinks its weird. We are not sure what could be the problem. He is not sick at all or else he would be acting like a big baby :) If you know what the problem might be or have had the same issue PLEASE PLEASE let me know and explain. I miss my perfume :(