I have had chronic sinusitis for 2 decades despite 2 surgeries, allergy shots, etc....when I got my concussion I had a sinus infection and have had a handful since. For me it makes everything pcs flare up worse, so I do my best to stay hydrated, take appropriate meds, get extra rest, keep the head propped up while sleeping, etc.

Sorry you have to deal with this, I know how miserable it can be!