Any advice? In 2013 we stopped at the top of bear tooth and I got winded walking to the overlook. Then went back down to Yellowstone without any more thought of it. Then it hit me, I didn’t feel right. Glacier in 2016 was no problem for me but my brother got that queazy feeling by Yellowstone. He touched it out to Cody and felt good by morning. So, any remedies to stave off altitude sickness for flatlanders? I remember watching TOP GEAR when they took Viagra to combat the altitude . I’m not doing that.