Hello, I just started having this same issue with not being able to take full breaths and weirdly, I just started exercising on my new treadmill for the past 5 days. I had this issue when I was pregnant and the doctors said it was due to my hormones. I was totally fine after pregnancy but now all of a sudden I can’t take a deep breath and am constantly yawning. I also started taking Nutrafol supplements two days ago when this all started so I’m stopping that ASAP. Has anything worked for you?