Hi and welcome to the MS forum - I think you will find this a helpful place. There is a wonderful ENT doctor on MEdhelp who has taken a special interest in MS and our members - Dr Park is online at
http://www.medhelp.org/forums/show/305
you may want to post your question there and see what he says. I know I have constant sinus drainage, but I live in Ohio in an area affectionately called sinus valley. Probably 50% of ourpopulation has that problem.
I hope you'll stop through here often, welcome again!
Lulu