Newbie here. I read a bunch of the posts and had no intention of signing up until I saw this. I thought I was the only one with this particular anxiety--I had to post and let you (others) know I have this too. Or close enough. For me, it happens while I'm in the shower--something about the warm water and the steam just messes with my head--and results in panic attacks more often than not. Unfortunately, no, I don't have any explanation for this. For me, I notice that anything that draws my attention to sensations of this type (where I feel like it's difficult to breathe, or I feel congestion, or disorientation (due to the steam and the enclosed space)) tends to provoke unpleasant physical sensations--tightness in the chest and cloudiness/depersonalization--which of course the anxiety plays off of and vice-versa. For me, I think it's a learned behavior/association--at one point, for whatever reason, I was feeling physically ill in the shower and now my mind equates showers to that physical state and provokes it. I don't have enough specifics about your situation to begin to know why you have this, but I would encourage you to think about it in this manner. I am personally prescribed klonopin for my anxiety (which has been an almost literal "lifesaver") and I've found that I should not attempt to shower until the medication has kicked in. I hope you are able to find something that works for you.