Has anyone lost their ability to vomit after RNY?

Im 6months post op and i think its not possible. I suppose that little thing is just too small to heave it up. even when i had a kidney infection and couldnt stomach water I couldnt vomit.
OH well. really helps you consider what your putting down there if you know you cant spit it up

Thanks for all the replies :)  Glad to know this is so common! 

 I have not been able to have a good, gut-clearing heave since my DS ..         I often wonder if it is due to the reduced sleeve size (after all, the stomach is one giant muscle) or possibly an impediment to the Vagus nerve resulting from the surgery ..     However, I have heard other DS patients say they don't have that problem ..  Strange ..      I just hope it won't get me in trouble if for some reason I need to vomit, for a health reason .. 

I dry heave also but only once did I throw up but it was different - it was a dark brown liquid, almost thought it was bile or something.  Really burned coming up.  Never happened again.