hey , i too also suffer from repeat sinus infections.... however i do not have the severe symptoms you display but i have heard many times that all of those symptoms can absolutely be present in a sinus infection. The reason why im replying to you is because about 6-7 months ago I had a sinus infection pretty bad and i was given erythromycin for it and it really never went away but what did i know?? im not a doctor right? so i didnt complain and just went with it and said well maybe its allergies.... well about 3 weeks ago now i had another severe sinus infection and this doctor put me on Levaquin for 10 days and it has completely changed how my nose and head feels!! The point is, amoxicillin and erythromycin arent the strongest of antiobiotics out there .... theyre well known for upper resp. infections but in my experience bad sinus infections arent even touched by them.... so if you dont feel better at all by day 5 of the antibiotics, call your doctor and discuss your options. Day 2 is really too soon to jump the gun, but it should help you feel better within the next 3 days or so! If somethin doesnt feel right call ur doc and discuss a med switch, and for my suggestion, ask about Levaquin :) GREAT MED.... gave me some strange insomnia but not anything to go crazy about :) GOOD LUCK :)