I know this might not be what you hope to hear, but when I was poorly with the AN I found my anxiety levels were very bad, I was physically anxious and shake-y. I believe it is because I was trying to get my body to function on little more than adrenaline. Since eating properly I am a lot calmer, and not just because I have dealt with the ED anxieties. Although dealing with those has been easier when I am fed, as I notice them creep in when I have slipped.
I know its hard, but I guess I am trying to say, don't underestimate the affect not eating has on anxiety, even strong physical reactions.
I find having something to play with, a bracelet or a ring. I have got little pots [you can get them from superdrug] and I put strong smells in them so I can smell them to distract/self soothe when I am stressed or anxious. Smells that I like are to me quite comforting. And by breathing them in/smelling them you are forced to breathe deeply in through your nose. Bonus!
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