jessy....instead of drinking the Bitter and Guiness, try "flushing out" out your sinuses with it.
On a more serious note........there is nothing that you can do to prevent sinus infections, but it sound as though there is not complete resolution of the problem after the attack....something is stopping it healing.
Go to your GP as you may need X-rays of your sinuses and if that shows persisting infection, then you may need surgical intervention.



