Hi anisa,
Well you are asolutely right about feeling breathless while walking or at rest. I just feel I want to faint and sometimes imagine myself while walking as falling down on the floor.It's so annoying. And you know what, the symptoms of tiredness, extreme fatigue, heavy head, are someting I have to deal with not only while hiking, but also during a normal visit to the mountain which I have to do every weekend. However, I was advised to get an oxygen boost whenever I feel the symptoms by inhaling some oxygen. I was wondering if this would help.