Not a surprising report, except perhaps to many patients, that antibiotics aren't generally needed for sinus infections. Earlier this year the professional society of otolaryngologists, that's ear, nose, and throat doctors, had a similar statement. Sinus infections generally are caused by viruses. Those infections that need antibiotics are often those where a head cold was improving and then suddenly got worse.
Don't be shocked if your doctor doesn't prescribe antibiotics before for something which was done in the past. With more resistant bacteria, like MRSA, it is important that we save antibiotics only for conditions that require it. If you do get antibiotics, finish it completely even if you are feeling better. Not completing a full course of treatment is another cause of increasing bacterial resistance.
With all of this knowledge, don't you feel better already?