I have severe sinus infection (acute frontal sinusitis), what are my next steps?

Hi all, I have a few questions about a severe sinus infection (acute frontal sinusitis) that I’m struggling with. I’m having debilitating headaches every day, concentrated in the frontal sinus area, but am not presenting with any other sinusitis symptoms. I did do a sinus x-ray and was told by a doctor that it indicates a continuing sinus infection. I’m taking an antibiotic (Augmentin) as well as a nasal spray (flonase) but I want to talk to you about next steps and how urgent you think the situation might be. Thank you!