My 4 year old daughter has had low fever 100-101, and thrown up at bedtime the past two nights. She just had her first experience with nitrous oxide gas and lidocaine at the dentist yesterday morning (threw up the first time 10 hours later), and I noticed the fever (99.8) after that. She's not been quite herself today (fever up and down, highest 101.4), eating little (brat diet), and drinking enough. But threw up again in her bed tonight. Could this be related to the dentist visit & procedures? Or unrelated, and at which point do I bring her to dr? We've never had a stomach bug in our family so if it's that I'm not experienced on how to treat.