A few years ago (March 2004) I was diagnosed with acute sinusitis after a bout with the flu. I took the round of antibiotics (
amoxicillin) I was prescribed and thought it would clear up. It didn't. I am now on year 6 of nearly constant sinus pain, pressure, headaches, dizziness, nausea and post-nasal drip. Occasionally I get so congested I can't breathe, then it will loosen up slightly.