I don't have a comic...yet. However, I do have a short tale to relate.
When I was in high school, I used to stay overnight at my best friend's house a lot. For some reason, his parents always used dinnertime as a forum to discuss their bowel movements.
On the subject of barf... you ever run out of liquid? Way after the chunks are gone? I swear I heard wind whistle up my ass I was retching so hard and there was nothing left to give inside.
I believe you're referring to a condition commonly known as the "dry heaves." The last time I had food poisoning I threw up everything I had to throw up and then some. Finally I was just wracked with massive convulsive heaving spasms coupled with loud, involuntary shrieks of dismay that ripped their way through my esophagus like burning hot, razor-sharp claws and devastated my vocal cords.