Congratulations! I am trying to stop smoking also and am on week #2 taking Chantix to quit.
Yes, your nose, throat, lungs etc are all going to react to the change and start cleaning house. Your chest may even feel tight. Many people get sick after quitting due to the upset in the body.

However; I would let your Nuero know about the pain behind the eye....could be just a sinus....but I would send over a fax letting the doc know how you are doing. Whenever I have something questionable, I send over a fax just so the info is in my file. Then I let the Doc decide if its important or not.

Good Luck to you!