Mild to moderate scattered paranasal sinus mucosal thickening as above. leftward nasal septal deviation. i did a ct scan of my sinuses. had a ct scan before and diagnosed with sinusitis. i still have headaches, so in your opinion.this the cause?

You have been diagnosed with sinusitis, a condition that lingers and needs a whole change of routine to cure even after the antibiotics. Please take a look at the sheet of recommendations for those with this condition: https://drneilmcleod.com/information-sheets/

Unlikely, however, you should discuss with the Provider who ordered the CT scan. Sinus irritation may cause headaches, and may respond to treatments like Flonase or saline irrigation; however, there are many potential causes of headache, some serious, all uncomfortable. See your Doctor.