I have been battling a sinus / strep throat infection for a month?

I have been battling a sinus / strep throat infection for a month. I am on my forth antibiotic. It started as a sinus infection then after the first round of antibiotics i started running fever, went back to doc suspecting fever and tested negative for flu, but positive for strep. Took the whole dose of those antibiotics and started feeling some better. But then ended back at the drs office with the sinus infection still there. went on another antibiotic. Well, there are obviously not working because i am now running fever again. Any thoughts?

Age:
Female
Medications: Lamictil and Topoxam