Firstly, see a doctor.
Secondly, how old are you, how much do you weigh, do you smoke?
Thirdly, do you find it easier to breath if your head is up higher on the pillow (if the answer is yes, then it is concerning).
Keep aspiring in handy. Next time it happens, place it on your tongue and let it melt. (if your situation improves, then it is concerning).
Are you fit and do you excercise? Are you perhaps in the process of loosing weight or working out excessively (it should be no biggy).
Try some regular cardio to increase your heart beat but not too much (I personally recommned anything BUT running).
Buy an oxymeter and measure your oxygen levels.
31 years old, weigh 155 pounds, prior history of CHF from birth. Generally I breathe easier in the upright position, it gets really bad when I'm flat on my bed. I will get some aspirin today. I am extremely fit, and am considered a lean body type. I have immense trouble eating at this point, so I keep to light foods throughout the day. My oxymeter shows at rest oxygen of 94, and at mild exertion oxygen to be 85, with a hr going from 65 to 175
I am not a doctor but many of these sound concerning. Your oxygen levels sound ok, but that could be expected if you are fit or extremely good at swimming especially.
Speak to a professional even it is a friend of yours.
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