Hello I am not sure if you've already come to a helpful solution yet, but regardless I thought my ideas may help another. When I was about 9 I started to develop symptoms like your daughters; angst at night because of feeling "weird" and "off", I would start to have trouble breathing (and I'm still not sure if this was due to my anxiety of feeling so strange) and a few times I had mh mother, after being hysterical, take me to the ER, where they told her I had GA as well and gave her some barbiturates to calm me. The anxiety stayed with me through my life as well as he wavy feeling in my lower half, felt when I'm laying down, as if I'm in waist deep rocky water. after trying sonmany things to overcome my anxiety, my sensitivity to others and the strange feeling, I've come to accept it all as a sort of gift. It's hard to explain, kind of like the difficulty in explaining the weird feelings precisely, but the way that I have come to terms with my situation is that I am more energetically sensitive then most people. it isn't necessarily physical or mental or something wrong with me that a doctor or drugs can fix, I am just a little different and feel things a little differently. Once I accepted this, the anxiety disappeared. In my opinion, the truth is that we are a energetic beings. The feeling I get in my legs, almost daily, feels EXACTLY like energy moving on two roads through my legs. It's he only way I can describe it, so now what I do is focus on the energy and try to either get it to spread through my body in a rejuvenating sense, or send it through my feet back to the world. Meditation and yoga (though I don't do much yoga..) and breathing exercises have changed my life drastically in dealing with my anxiety about things I have no idea about (being anxious for no reason is one of the most terrifying and annoying experiences). I hope this helped someone a little