I can assure you, when Jacob is sick (and it seems often, he was also born premie) his levels are higher during this period. They go back down. Its short term. Its not the best option of course, but it is temporary, and I have been assured not to freak out (I do very easily! haha)
The short of it, is it will be ok. Its normal to go up when they are sick
We have actually had levels go up, where we were unaware the poor tyke had an ear infection. Seeing as his levels were up, we went and had him checked out.