I'm Feeling Really Paranoid About My Breath And A Smell

I'm feeling really paranoid about my breath and a smell from my nose, when people are near me they are always rubbing there noses and hinting saying things like do u want a chewing gum, etc, when I've already got a chewing gum in, I don't know what to do, I brush my teeth twice a day, floss and use mouth wash, so I'm not sure if it my breath or if it's coming from my nose, can u please help?