I'm asthmatic too so know what you mean about waking and wanting the comfort of your inhaler. For me, being pushed/falling could have to do with being/feeling out of control. Is there any anger in your dream? I remember once I had a dream where I was in an airplane cargo area and the plane made an abrupt turn so everything fell to one side and I got really really angry that I couldn't help myself, had to fall and not be in charge of what happened to me or around me. It was a feeling like I get when I think something is "unfair".

Having someone else (your psychiatrist) push/force your hand so you had to go into the water; anything like that happening in your actual life, are you being forced to do things at someone else's say so that are otherwise scary to you, and maybe faster than you want, something like that?