Greenmile,
Yes especially early in my attacks, that is the exact position I was in constantly, rolled up in a ball paralyzed feeling. Actually my husband picked up cues afterwards when I was overwhelmemed with anxiety before attacks would come, because if I was sitting, I tended to sit on one leg, and draw the other one up to my chest. And he would point it out, I wasnt realizing this myself, but we finally could address that stage, to start drinking cold sips of water, talk about something other than panic, and use the breathing techniques, something else that I can decipher is if my stomach is not rising up and down, Im under anxiety, and do the breathing techniques to get it back on automatic to help offset the attacks.