Staying hydrated, easing into higher elevations, avoiding alcohol, and using an OTC pain reliever.  Much to my Asian father's disappointment, I am not a doctor, so I can't recommend any pain reliever brands! But I do recommend that you talk to your doctor if you aren't used to higher elevations! Altitude sickness hit me hard in Colorado (especially on my first trip). I felt dizzy and nauseous, and while the landscape was distractingly beautiful, I would have loved to be more present.