Question: what to do when you feel a sinus cold coming on?
Answer: Drink plenty of water. To help flush the virus out of your system, make sure you're adequately hydrated. ... 
Eat immune-boosting foods. ... 
Add moisture. ... 
Clear the sinuses with oils. ... 
Use a neti pot. ... 
Ease facial pain with warm compresses. ... 
Use over-the-counter (OTC) medications. ... 
Get a prescription.