Hi, I have weird observation. I dont know what it is related to but when i get tired i feel like i will not be able to breathe and my breathing gets heavy. I start automatically mild deep breathe and my focus will be on breathing. My pulse rate will be around 85-90 bpm. Oxygen saturation is 98%. I got done spirometry once few months back and it was normal. All reading were above 100%. Please help why i feel so? Will it cause any harm like breathing gets stopped or anything related to breathing. Thanks