I assume that it is all neurological, but Benadryl seems to help with the pressure, and sinus
type issues. I have also seen an ENT and had an allergy
test, and summertime allergies (grass, pollen, etc) are bad, but my allergies shouldn't be bothering me now according to the tests. He found no pollups in my sinuses and said that they looked normal on the MRI. So, I am also on the MS forum as well, and have had some useful feedback there too.