Suggest Treatment For Frontal Sinusistis

Hi,
I am Sushanti. 26 yrs old.

I m facing frontal sinusitus since past few years. i hardly get 2 days in a week when m not sneezing. I have changed many doctors and have left no stone unturned. I have seen my nasal tissues swelling towards the left side. Doctors have been prescribing me Allegra and nasal sprays.

Please HELP!! Let me know where and how i can take treatment for this.

Thanks and Regards,
Sushanti