I'm gonna talk about story when I went to Bolivia. Not only in Bolivia but also in other countries,whenever I go abroad,I suffer from jet lag and diarrhea. So I think to prevent me from suffering jet lag, it's the best way to sleep in the plane. But I'm not good at doing there. So always keep awake in the plane and feel so sleepy where I arrived. The same thing happened to me,when I arrived air port at la Paz where it's located over 4000meters. I feel so sleepy,sort of dizzy,and have headache and feel like throwing up. I went there with my friend and asked him if he had aspirin. And he gave me it saying it will cure you of your headache and dizziness. But it didn't affect headache and dizziness.Before coming to Bolivia, my doctor told me to leave la Paz for lower place if you keep feeling dizzy or having headache. So I discussed with my friend whether we should leave here. But we decided to stay here believing taking a 2 days off will make my physical condition better. 2days later,I got better! My body got adapted to la Paz which has lower density of oxygen. We stayed there for 2weeks and got experiences I could rarely get in Japan.