Yep, have had the sinus flare up also on O for decades. Been using cortisone nasal sprays for 20 years since having three surgeries. Am trying a few other things over the last couple of months that might help with this, such as;.
1. Eliminating some food intolerances.
2. Halo therapy / Salt Therapy, i.e. spending time at a local spa that provides a room with controlled emission of high quality salt. Don't think it is a cure, more symptom reduction. I will advise you guys here, if there were any worthwhile improvements and reductions of sinus inflammation when treatment is completed in a couple of months.