Mercifully my tinnitus only happens when I have eustachian tube congestion. I have elaborate jaw exercises that open things up enough to stop it, and for a while before and then after I moved I had other daily rituals to keep my sinuses clear (I'll spare you the more medical options but it included daily mucinex, spicy food and hot tea to open up the sinuses and keep them open).

Eventually my body got used to the local pollen, thank god. I haven't needed chemicals or lavage for months.