Sir I am 72. Male. I have no health issues at all. I am active. The problem is that I get breathless with slight exertion. While sitting or lying down I am okay. With exertion my o2 level drops to around 85. But after a minute it gets normal to 99. This is seen on a finger pulse oxymeter normally o2 level is 99/100 I do not use an inhaler I do not have asthma. To reduce breathlessness I am advised to take tab supradyn ab three times a day. Spiromont f 180 in the evenings nistami inhaler once a day but the symptoms continue please advise thank you.