I count. In my head obviously if it's a public place. Sounds really stupid and basket-casey, but works for me. And tell yourself that by the time you get to 50 you'll feel noticably more normal, and you generally do. Or I do. The other thing I do that helps is focus on the shape of things about me. Like the width of a pavement, height of other people, reaffirm that it is all there in a really simple way, keep a vague model in my mind and believe in it.