hate being sick

I really don't like being sick at all... my temp keeps changing and I feel nauseous all the time. singing even feels weird and the nauseous feeling is still lingering. I don't even know what this could be. help!!! you would think that working in a pediatric doctors office, you could get things to help prevent an illness; WRONG!!! the one girl that works with me gets sick all the time. during the winter, no patients came in and now all of the sudden, the phones are ringing to make appointments because their children are sick. sore throats, swollen nodes, runny noses, coughs, wheezing... strep and the flu is coming around.