Difficulty breathing at high altitude

Cusco is in the beautiful Andes mountains at an altitude of 3310 metres. Many people (ourselves included) who transcend more than 3000m suffer with headaches extreme tiredness and difficulty breathing. Many posh tourist hotels have oxygen in the rooms and the really unfortunate tourist may even end up in hospital with HAPE High Altitude Pulmonary Oedema or HACE High Altitude Cerebral Oedema . We are used to living here although we do get tired easily but many of our visitors suffer from the symptoms above and Anjanette's poor dad is suffering with difficulty breathing from the lack of oxygen at this altitude so we are hiring an oxygen cylinder and he is having a few puffs a day which helps him!