Why do I feel worse/ earache?

So I have had most of the signs of sinus infection (headche, sore throat, mucus drainage) for about 2 wweeks. Well I finally got to the doctor two days, and she confirmed my sinus infection and said that I had A LOT of fluid behind by ears, but my ears had not bothered me.She put me on azithromycin 500 mg (1 a day for 3 day), saline spray as needed, and mucinex D as needed. I started all of it about lunch time the first day, and by 8 pm I had an earache that was so painful that I was crying. It hurt from my ear all the down my jawline almost to my mouth. I was up until about 3 am. I tried eardrops, heating pad, massaging around base of my ear but nothing working. And ear would "pop" like when the pressure changes and it was painful each time, but one time it popped and it was almost immediate relief. But I called the doctor and she prescribed me ear drops and a mild pain pill. So my ear will still pop and it hurts a lot when it does, but it has a full feeling and my hearing is impaired in it. Also there is almost like a ringing noise in it. And my headache has intensified to where I have to have an ice pack on my head and the pain killer has not helped at all. So overall I feel worse than when I initially went to the doctor, although it has stopped my sore throat. I only have one my antibiotic so you would think I woould feel better now. Just taking any thoughts on why I feel worse. Also I am going back to doctor later today. Thanks