Camping and cant breathe!!?

Johanna Peaks, who spent several days camping at a very high altitude on the mountain. She noticed that her breathing was faster than normal and that she was beginning to feel nervous, excitable and her muscles seemed hyperactive. What is a reason for her symptoms? What condition could be suffering from? How is her body going to work to control her condition? How will her body maintain homeostasis of the pH in her body fluids?