Where are you.
Has your weather been warm then cold.
I developed the most awful allergies/sinus a couple years ago, didn't realize it until I keep getting the same awful cold for a couple years running. Never had an allergy in my life.
We gargle with warm salt water for sore throats and do the salt water snort for sinus, just dip a finger and snort it.
My brother developed them too. He started yapping about alfalfa tablets. I put it off until I was given a bottle. Dang if they won't get rid of most sinus headaches (top of the head and behind the eyes) in moments!
Gosh, I hope you feel better, I can almost feel how awful you feel! : (