4 years ago and nobody responded? Well, first time having acute sinusitis myself. Same antibiotic was used. Same areas of facial numbness. It all started as if it was a cold, but mostly only affected the sinuses on my Left. Occasionally the Right side would swell briefly, but shift back to the Left again. 5 days later, it's ALL the LEFT. 10 days later, it's still ALL the Left, but I can breathe normally. It seems all the inflammation is now outer-sinus membrane, not inner-sinus membrane, and it's still pressing on that particular facial nerve which is what's causing the numbness in the Left side cheek/nose/brow area, just not as bad as earlier. I get little quiver jumps in some nerve endings in the cheek area, makes me want to scratch it and/or hold it still. I call them "Quickens". I think it's a sign the feeling will come back soon.