Random cough and choking

Fion
I noticed lately my son will have this random cough that lead to choking sound. Usually he is fine few seconds after tho.  He has no fever and he doesn't look sick.  
Any one has experience like that? 
It scares me and it happens at night while he is sleeping too. 
We are having doctor appointment next Tuesday, but since is hard to tell the doctor, would like to get some comment from whose baby had this experience. 
We hoping to catch it and able to record a video for the doctor )
Thank you !