Often when you take antibiotics, the drugs kill bacteria and the dead bacteria release toxins, which make you feel worse before you feel better. Also, antibiotics often don't work in sinus infections, because the infection model is different than the model for infected tissues, according to Mayo Clinic research. The Sinus Flush I developed removes the mass of infected mucus. If you try it, remain on the antibiotics, as they will help.
http://www.medhelp.org/user_journals/show/2322
The Flip-Turn Sinus Flush is mildly risky, because you have to bend over to do it, preferably in a shower, but you can also do it outside on soft ground, or you can kneel down and lean over a bathtub with the shower running.
As Londres says, you should see an ENT to make sure you don't have a physical anomaly that is causing the chronics.