Anon I know how you feel.
Life long problems with sinus infections.
I got a new Dr who asked me a basic question.
"do you see more of a problem during allergy season" Yes! spring and summer worse for me started taking claritin and havent had one this summer! Sinuses can over react to allergies, swelling up and causing a lovely dark, swollen home for an infection to live.
Start taking allergy medication. Give it 2 weeks and see if it makes a difference.