In addition to all of the valuable advice above, buy yourself a Neti Pot from your friendly local yoga shop, follow the instructions an use it twice a day.
You will (in equal parts) be amazed and horrified at the volume of infectious green gunk that comes out of your sinuses!! I called mine "Snotctopus" as it resembled an octopus squeezing out of a crack in the rocks
Once you've seen the results you'll never want to be carrying all that gunk around with you again!!
PM me for a link if you need to mail order.
Get well soon!