If you don't have the time to get into a doctor, you should try the clinic inside Walgreens or Kroger's (if you have Kroger's near you). They can prescribe meds. I also second the Mucinex, get the Mucinex-D from behind the pharmacy counter. Last time I had a sinus infection, I went to the Kroger's Little Clinic and was in and out of there within the hour with my Z-pack and Mucinex-D, felt so much better within a day. The plane ride will be miserable with a sinus infection.