I don't have asthma and my allergies have never done anything like this to me. Usually just the itchy eyes and sneezing, but they haven't been acting up.
Last night I was walking my dog at a pretty good clip and all of a sudden I got short of breath and could not catch my breath. It lasted for several hours. The first hour was the worst, but it took several hours for my breathing to get back to normal.
Was a little short of breath for maybe 45 minutes earlier today at work and then when I was out cutting my grass, got to where it was hard to breathe again. Didn't last very long once I stopped cutting the grass
I had no other symptoms other than being short of breath.