Well My Age Is 35, 5.9', 85 Kg And I

well my age is 35, 5.9', 85 kg and i suffer from DCMP. i have been taking asprin, hopace and starpress H xl 25 for quiet some time now. however i am planning to visit leh which in the month of june 2016 which means i would be travelling to heights of 11000 ft- 18000 ft. just want to understand whether it is safe or not.