Do you have any other symptoms? I have this air hunger (as I call it) or air gasping. I have laryngopharyngeal reflux disease, hiatus hernia and vocal cord dysfunction. I'm listing all those things because I completely understand your experience. Look up laryngopharyngeal reflux disease/respiratory reflux. This can cause all the breathing issues you describe and the condition flares up and then goes again which is why you will feel fine and then it comes back. It is triggered by diet, allergy, lifestyle etc. If you can do physical activity without issues it doesn't sound like asthma as such (I have this too since I was born.) I would suggest seeing an ENT to do a scope (laryngoscope) to see your vocal cords as a first step. If they think you have anything they can advise. I'd say that's the best Dr to see first to try and figure it out. To note sooo many drs don't know about lpr so it is complex and many patients (I am one) bounce around so many specialists and get dismissed. If you have the luxury to choose which ENT you see try choose one who knows about lpr. I am of course not a Dr but just sharing my experience, I have spent a good few years trying to understand what an earth was going on with me and it was an ENT who finally gave me answers that has helped me start my attempted healing journey. Look up Dr Jamie Koufman