I have a major problem with sinus pressure the day after playing a challenging job (upper register playing). I've been examined by an Eye,Ear, Nose and throat specialist and have had an MRI done and everything came back normal. The only way I can describe the symptoms is that it's like suffering on the 3rd and 4th day of a hangover. Major sinus pressure and light-headedness. Anyone out there experience this? The symptoms lessen between jobs.