After getting a flu some years ago, I had a similar problem ever since it cleared up. I have no idea if it is like yours, so it might be a longshot; mine is cl

After getting a flu some years ago, I had a similar problem ever since it cleared up. I have no idea if it is like yours, so it might be a longshot; mine is classified as "mild exercise-induced asthma". It is worst in cold weather. I've also found that the inhaler helps only marginally, but it does help to start out each run on a much slower than normal pace, even walking (sort of giving the airways time to adjust), and also starting out wearing a scarf or big collar over the airways to trap moisture in the airstream. It's kind of annoying to do as my usual routine was a good warmup then just start right-off at full pace, but since then, I kind of pay for that. Good luck, I hope this helps or or you can find something that does!