Is Stuffy Nose Post Nasal Drip Causing Headache And Jaw Pain?

i've had a stuffy nose and post nasal drip since Friday. I also have a headache and my left side of my jaw aches along with my top teeth. Saturday and today I've had I think loose stool. I'm not sure if its diarrhea cause I only go once and it is after i eat lunch and not be gross but when I look in the toilet it kind of just piles ontop and its not runny or anything. This isn't the swine flu is it?