I am experiencing the same symptoms. I don't have any cough or wheezing, no GERD, or acid refluxes whatsoever. I have seen someone for this but I'm afraid they didn't do a great job of trying to help or figure out what is wrong with me. I had labs done and everything came back normal. But obviously that won't help much with going in and figuring it out. I did not get sick before this, I remember when I was younger, I had shortness of breath sometimes but it wasn't as bad as recently. I barely started with this in December. It is not exercise induced, I can sleep, there are times where I feel it before going to bed. I have been nervous with a bunch of tests I've had in college, I'm not sure if that is what triggered it. When at work it comes and goes, some days will be bad and others I won't have the issue. I try not to think about it too much but whenever I get it, it bothers me not knowing. This MD told me it might be that I'm starting to get asthma, but I don't have any coughs or wheezing so I'm not sure. I also don't smoke. Was anyone able to figure out what was going on or get good treatment? If so what was it? This is worrying me.