How long does sinus inflammation last after bad seasonal allergies and infection? ive had it since mid-september?

Tricky sinus allergy: Allergies can be very tricky - because once the body is 'activated' like that, it may take a while to settle down. I usually explain that about how long you suffered for BEFORE treatment, is about how long it takes for things to get totally back to normal. (Climbing up the mountain and climbing down is the same 'distance' - hopefully therapy will speed up the recovery but everyone is different).