The same thing happened to my dad when I was 11. I was just about to start middle school, and was already terrified enough without learning that I'd have to go through the process in a new city with none of my friends.
It was the end of the world for me as it seems to be for your son. I screamed and cried almost every day, sometimes pretty hysterically.
But, the move came. I went to my new school, met some new people, made friends with a few of them, and eventually I was fine. Something that helped the transition was that every summer, I would go and stay with a friend from my old school for a week, or they would come visit me in my new home. Even if this is not possible, your son could keep in touch with his old friends through email and/or instant messaging.
It'll be the end of the world for him now, and he may cry for a while and he may be mad at you, and it'll hurt to see him like that, but every life change is the end of the world for teenagers, and he will eventually move on.
The throwing up may have been a little dramatic, but I really don't think it's that much worse than throwing a temper tantrum at that age, and as long as the vomitting episode is not repeated, I wouldn't worry about that too much.
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