I had a sinus infection about a week and a half ago and the doctor gave me three days worth of mild Penicillin. I took it all and now most of my symptoms are gone: I have no fever, no cough, no colored discharge from my nose, but I am still experiencing sinus pressure - not pain, just pressure - and soreness in my upper teeth when I stomp my foot or go up and down stairs. Is this a lingering infection or am I experiencingn allergies? Any help is appreciated because this is driving me nuts (oh, and I live in Japan and can't speak Japanese so I can't explain my symptoms to a doctor)