nsbsalt

Me and my roommate are having an argument about what makes fog, I say it is the temperature difference between the water vapor and the air. He argues that fog comes from really humid air and I am wrong. So please answer the question of the difference between water vapor and fog. Please use sources or he will think I am making things up.

I am a college student with no medical insurance. I had a cold for a while and it was mostly gone all that was left was a stuffy nose. One night I didn't have any tissues so I just covered my nose lightly and inhaled hard through my nose to suck all the mucus into my throat to spit it out. Disgusting I know but it works. When I did this I felt a heavy pressure on the upper part of my left nostril then an excruciating pain that felt like my brain was hurting so badly my vision went blurry for around twenty seconds. Now the sinus pressure is always there and sometimes when I lay down I feel it move almost like when your pressure in you ears change in a airplane. Also have what I assume to be sinus headaches that come and go. My roommate says it is just a sinus infection but do they start hurting abruptly? Cause all this happened instantly after I cleared my nose. After this happened I was feeling my nose and I noticed the side that has the pressure feels like there is a small crack on the upper part of the nose where it is bone instead of cartilage. The other side does not seem to have this.