@tonyagregg and @gabrielm I am experiencing the same thing. I am 22, fairly active and I used to run half marathons so im assuming my lungs and heart are fine. However, a few days ago, I began to not be able to catch my breath while just sitting at work. I didn't think anything of it, as I've had small bouts of not being able to get a real breath before. however, it lasted all day. the only relief I could get was by forcing myself to yawn. It lasted into the evening, and my fingers even began to tingle a bit. I went to bed afraid I might not wake up!!! lol. but I did wake up and now its day 3 of the inability to breath regularly. Still, the only way I get a satisfactory breath is by yawning. I was prescribed an inhaler when I was 16, but I only used it once or twice and now no longer have it. Would an asthma induced inability to breath cause 3 days of awful breathing? I feel everyones response to this post, because while I can continue to go about my day seemingly fine, I have a slight panic in my heart wondering if this will be the rest of my life. I guess I will continue to monitor the situation and if it gets very bad see a doctor. something unusual tho, the day before I started experiencing SOB, I had petechia on my upper thigh. could this correlate to anything? the petechia is still present but seems to be going away. This all seemed to happen so randomly and unexpected! has anyone found relief or any more ideas or advice? my heart rate is around 60-62 beats per minute, so that seems fine.