I believe that teething does cause vomiting. My 17 month old is late getting his teeth - he only has 6 front teeth right now. But he is cutting his upper molars, and he runs a temp and vomits sometimes. I'm sure it's pretty painful, cutting those teeth, and sometimes great pain causes upset tummies. I'm sure there are experts out there that will argue that "scientifically, no, teething does not cause vomiting and fevers" but I know different from experience!
Of course, there is a bit of a flu bug going around right now, too. So it could possibly be that. But I am still convinced that when teething, some children will get flu-like symptoms.