I have a sinus infection rigjt now for the past 4 days (I even had sinus surgery 2wks ago to help and obviously didn't) anyways as of yesterday back on antibiotics and nose steroids. I ha e had sinus infections 2-3 tines monthly for almost 2yrs. For me I feel like I have the flu only without the vomiting and diarrhea. I geel very tired no energy, my jead kills me Tylenol or sudafed dosen't work with sinus infections but I cant take Ibuprofen for another week cause the surgery I had. You can have a fever with sinus infections but the symptoms I mentioned are part of that as well. Also alot of drainage down your throat. Your teeth can hurt. Your nose can burn and feel dried.