I'm having trouble with shortness of breath when I'm talking and especially after walking up the stairs. This has been going on for about three days now, and it feels like I'm under a lot of stress just to breathe. It's almost like what Id imagine an asthma attack to feel like. I've never dealt with anything like this before. What could be causing this sudden difficulty in breathing, and should I be worried?

might be due to asthma or reduced blood