Are you taking the Mucinex DM?
Any nasal spray?
I am concerned about the headaches getting worse like that. With a sinus infection it sometimes takes the antibiotics a little longer to penetrate the sinuses. I usually wait until about 5-6 days before changing anything.
However, if you are getting worse then you should follow up with her. If you were staying the same then I would wait it out a few more days.