I have seasonal allergies and sinus issues too, but about three years ago, I started getting what you are describing. I missed a week of work because of the dizziness. There was no pain, no congestion, nothing but the dizziness. It happens like clockwork now in August. It doesn't seem to be as bad as it was the first year, maybe because I know it isn't anything serious. I had a CT scan the first year and they found "mild sinusitis." I don't do anything to treat it, just bear it. Keep using the saline. It's the most natural way to treat any sinus condition.