Yes, yes, yes. I've had similar experiences to the one rosefox mentioned. Once, when my back was hurting very badly and I was lying on the floor, mentally trying to calm the nerves and soothe the muscles (because what the hell, it may not help but it can't hurt, and I was in too much pain to do anything else at the moment), I started having these vivid memories of my early childhood: specifically doing laundry, preparing meals, and tending to my 1 year-old sister when I was 3 and 4 years old. So... okay, then. (Note: I generally have trouble remembering specifics of my childhood without some serious cues.)

Anyhow, I've figured out via both study of psychology and trial-and-error experimentation that I can get rid of those awful bodily feelings, by giving my body another, easier reason for those feelings. Therefore, if my heart is pounding and I'm sweating due to anxiety, I go hike or run the stairs or whatever until my body is convinced that the pounding heart and sweat were due to physical exertion, not anxiety. YMMV, but backed up by clinical studies and such. (Because that ALWAYS means it works.)