Louise,
Please don't worry...easier sad than done right? At the hieght of my health anxiety, I had many sinus infections, mainly because I was scared of them. I had allergy problems and pressure in my face too...all because I FOCUSED on it.
A sinus infection is common and can be treated with antibiotics if need be.
A migraine, though obnoxious, is a result of all the INTERNAL reflection you are doing right now.
Give yourself a break and go outside, do something physical, or just relax.
Since I got over my health anxiety 5 years ago, I have not had another sinus infection or migraine.
Be strong!