I don’t suffer from hayfever, only very occasionally, like once every few years have I been affected that way (sorting dusty books is another matter). However, yesterday and so far a bit today I have had a return of that shortness of breath especially when doing things in the garden.
So my question : can pollen affect your asthma straight as it were without causing hayfever first? That would explain things to me, not just yesterday or today but more than that.