Understand … I went almost tens years with being short of breath upon minimal exertion but had nothing wrong with me until finally my husband suggested the doctors check my spine. An X-ray showed that I had a herniated disc at C5/6. I have also experience md the breathing problem that is discussed here and it was a little worse after surgery and somewhat better now but still occurs and I’m wondering if there’s another pinched nerve. Like everyone here, I was healthy and worked out at the gym previously. Just a thought for you and others