Hows the not smoking and your symptoms doing?
Are you feeling any better?
I quit 5 days ago, and I was definitely nauseous for the first 3. I felt like I was having hot flashes too, so maybe the fever is a result of that. I don't know if canker sores are connected at all, have you had them before? If outbreaks are stress induced, quitting may have caused that too.
After I stopped smoking, I experienced slight nausea and lots of fatigue the first week. So it's possible it's part of the withdraw process. But I don't know about the canker sores or the fever.