Has the doctor taken a sample to culture to find out what EXACTLY is going on?

What doctors often do is treat what is the most likely cause, but since your's hasn't responded yet, they might be treating the wrong thing and if they don't get a culture and know what is going on, it could persist.

My brother in-law had an ear infection that wouldn't go away even though he was seeing his doctor and taking medication and it turned into toxic shock and nearly killed him. I'm not trying to be an alarmist, but this kind of thing scares me after what he went through.