your one time sugar is 180.then u must go for Fasting blood sugar level and blood sugar 2hrs after meals.then consult a doctor to check the report.
If you have blood sugar problem ie Diabetes
then u must take proper care for your sinus infection
of say any infection in ur body.
In sinus infection u need to take care and see for alarming symptoms like---headache,continous high grade fever
,,visual disturbance etc.
So do not take it lightly and consult a doctor near u and get urself checked for ENT and blood sugars.