Certainly there can be an asthma component to all this, but IMO it is not the main cause of your current SOB. I just can't see it causing you continuous problems like this has now and not be improved with inhalers/treatment. And it certainly wouldn't improve when you lay down if asthma. I really think the fact you have improvement when laying down is key in determining what this is (or is not).

Of course you could do a methacholine challenge test if you want to confirm or rule out the asthma.