Particularly with cold weather?
Waiting for a hospital appointment April. But basically I had a breathless episode running in the cold. Then had a bad virus and felt breathless afterwards. Got given a blue inhaler and referred for investigation.
I was feeling good so I did a big mountain walk (Scotland) yesterday and am now back feeling breathless again. 
Anyone else ? I feel a bit despondent because exercise outside is a huge part of my life (and I live in a cold place!)