I had a similar feeling on Levemir, verging on a headache, @Jen. I have chronic sinus issues, too, and it wasn’t that.
On a completely off-topic note, it’s nice to see doctors somewhere practice medicine appropriately. I was given round after round of antibiotics for years for chronic sinus infections before finally seeing a specialist for surgery, and still no one thought to do a culture until 3 years later (infection was, not surprisingly, still there).