S.M.
My son had his tonsils and adenoids removed at 14 months. He stayed on tylenol w/ codeine for a week - it was very painful for him. I think the congestion and runny nose are just where the adenoids were blocking everything and now it can finally come out! I would give it another couple of days to see if it clears up on it's own.
It took my son about 10-14 days before I finally saw improvements in his breathing and sleeping. It takes time for the swelling to go down. However, it you feel like something isn't right - it never hurts to make a quick call to the doctor's office.