I had an off-wing flight with a girl that was doing average if not better. We finished up the high work and spun our way down and entered the landing pattern. After the spin(s) and a few laps in the bumpy pattern, the stud passed me the controls for a moment. I flew the pattern, figuring she needed a drink watched her head go down a little bit and then looked like she was working on something up front. Finally she took the controls from me and we pressed. I asked what was going on up there and she said she got sick but was ready...and in less than one lap around the pattern. We completed the hop and she progressed. Impressive boot and rally.
As an instructor at VT-1 oh so many years ago I had a Marine student who would get sick at the oddest times. He would do great during high work, spins, aerobatics but would sick up in the landing pattern or something equally odd. Turns out he had an inner ear problem, had surgery, came back through with no problems and went on to get his wings. Always felt for him as he was a good guy and trying hard, glad to hear that there was a reason for his nausea and was able to get past it. Sometimes things are just beyond your control. But he hung in there and rode it out. Had my respect for sure.
A buddy of mine had a student vomicate all over himself and the cockpit. Ol' Dave thought the stud had a bagfull still in the cockpit and told him to open the canopy and throw it overboard because of the strong smell. Dave wasn't thinking properly and had his section of the rear canopy open as well to evacuate the smell and the student who, rather than having a full barf bag had a handful instead, throws it over the side and the draft carried the "liquid" right into the rear cockpit and into Dave's face. He said there were little pieces of ham trickling down his visor along with a yellow-green liquid. Dave got the dry heaves, the student couldn't land the aircraft so Dave called home and asked for a straight in to the nearest runway. Home field thought that there was someone about to die in flight from the sound of Dave's transmissions while heaving and called all the emergency vehicles on the field to meet them on rollout with a very smelly airplane. It took the student a while to clean the cockpits. Ah, memories.