Teething, vomit & Rash?

This was posted by a friend on another forum, im reposting on here for advice:

connor has not been feelin rigth since we left germany

just b4 we left he had this rash all over his body,they looked at it and said it was nothing

gave me some cream,so that was fine

we got back here and it was still there,now it is not a rash but very bad dry skin all over where the rash used to be

it is goin into red blotchies and it is crackin,so i have been puttin more and more cream on

also he is gettin he front top teeth in,so i thot that it was just all to do with this

but just in passed week he has went off his food,but always havin his bottle at night b4 bed

now he is eatin and then about half hour later he has very bad projectile vomit

tonight he had the same after his night bottle,3 times!!!

i ever seen toast from lunch time

so is this normal in teethin? is it ok that he is so badly sick wen it happens?

he is fine in him self,no change at all