Januvia and next morning

I just started Januvia as a supplement to Actoplus Met, While my blood sugar, especially in the morning, has shown a significant drop, the day after I took the first pill I noticed a sore throat and woke up the next morning with something like a cold or flu, but without nausea, etc. My wife said it might be due to the Januvia and there is no doubt that they fit the most frequent side effects. However, it's that time of year and there is something going around. I was at my doctor's office on Monday and could very well have been exposed to something there. I noticed the next day that I didn't feel that well and thought it might be low blood sugar, but when I checked it, it was fine (103). I am a pilot and the FAA has certified Januvia with a minimal waiting period. While my blood sugar has been within acceptable range, my doctor says he wants to keep it that way, hence adding Januvia.