This thread:
http://www.yorkietalk.com/forums/showthread.php?t=78517 has some great info AND videos of CT vs. reverse sneezing, it might help.
Those noises are scary, I know. Wylie did it more as a pup, and he did outgrow it - even more so as I gave him premium / homecooked food. Marcel seems to do it more during allergies. Keep us posted and good luck!