W.B.
Hi,
My daughter did this at about 18 months. She would start making the awful choking sound, and I would jump up and say "Are you ok?" and she'd be fine. I finally realized that she was just doing it for attention. What I did, and this is just me, was when she made the noise I would calmly watch, trying not to let my panic show, to see if she was, in fact, choking. And she NEVER was. She doesn't do it now, b/c I don't react so much. And I had to remember, if she was truly choking, she wouldn't be able to make a noise or anything. It's scary, I know. Good luck!