Yes, He threw up
I wouldnt think that would be to do with teething personally, probably a bug? I would just try and keep him well hydrated and eating whatever you can get him to eat and keep down like maybe some toast or banana and keep an eye on him and let him sleep as much as he wants
Did he throw up do you mean, or did they just say hes not well in himself? If hes in a lot of pain with teething you can give calpol or nurofen