@gabrielm thank you for posting your experiences. I started having very similar symptoms in 2010 and wanted to share some of my knowledge. I went to the state hospital where I had chest X-rays, stress test, brain mri, abdominal ct, pulmonary function, and a few more with no conclusive results. I was eventually referred to psych where I was heavily medicated to reduce what they determined was stress induced SOB… that didn’t help either and eventually came off the meds. I then went to an allergist for allergy related stuff, and he gave me a test that measured how I breath in, and showed almost like a shake when I inhale. He had me do some breathing exercises that do help (basically sticking out my tongue and exhaling in huffing sounds). The other visit that help was GI were I was found to have a very acidic stomach and was put on Prilosec. I have noticed a correlation between eating certain foods like onions and garlic that lead to more heartburn and my air hunger symptoms… but not always. I have noticed that when I become overly tired, or after a workout the symptoms appear. I wish I had an answer, but after a decade have concluded I may have to deal with this the rest of my life. Sometimes it gets so bad, it triggers an anxiety attack, so I sympathize with everyone who has to deal with these “attacks” of breathless yawning.