A good guess, based on what you describe, is sinus issues. The barometric pressure fluctuates with the weather. For some of us, it can mean sinus pressure resulting in headaches, stuffed head, etc. To be sure, you might talk to you doc next time you are there. In serious, chronic cases, surgery cam sometimes help. My sister ended up going that route. If you do not have any issues with high blood pressure, many people get relief with sudafed. (Ever notice that scuba divers use it before dealing with the pressure changes of diving?) Welcome to the collective, by the way.