Turkey looks to be vomiting?

[kianav]

I have a royal palm tom who looks like he is trying to vomit (for lack of a better way to explain) he is my only turkey, he coughs once in a while but basically makes this up and down motion with his throat like he has something stuck or is trying to vomit-someone suggested maybe it is gapeworm, I treated him with ivomec one time last week but there is no change, he drinks but is not eating and has dropped a lot of weight, help!
thanks in advance!!