Yes, I have & I feel so much better at higher altitudes. Last summer went to Colorado, & I felt human again, hardly any altitude sickness. My husband is a fit & active guy, and he had altitude sickness for a few days. I did well at Yellowstone. Maybe it could be also because where I live near Charlotte, NC the humidity is high.
Yes, I have a problem with motion & planes sometimes.
Drinking a lot of water is key at higher altitudes.
I always remember Micheal J Fox saying his Parkinson’s symptoms were basically gone when he went to the Himalayas.