Nozzle problem?

I have the Badger Double action 150 airbrush and while I was painting I had to stop and sand my F-15 in couple of places. I started painting again about 5-10 minutes later and noticed the airflow was drastically reduced, but the paint still came out, I figured it would go back to normal after a few seconds of spraying. Well it didn't. It then it started spitting and spraying off to one side, then it just stopped spraying entirely. I then thought "oh I had better clean the nozzle". I cleaned said item, and it worked for a couple seconds then stopped it (that was spraying with water) spraying all together no air flow coming at all. I then upped the air pressure and it worked (with water again) great, I was getting a high flow of water and and a normal full spray pattern. I then changed from the cup to the bigger glass bottle with Windex and it stopped working again and air flow again was reduced. I went back to the little metal cup and it refused to work also. Both cups were free of obstructions and nozzle was clear to, I could see daylight through the other end. I soaked the nozzle in enamel thinner over night and still no luck. The nozzle is clear and the rest of the brush works fine. What is causing the failure here? HEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEELLLLLLLLLLLP!!!!!!!!