I know you're rationing your Xanax---have you had any today? You could be experiencing withdrawal its often worse than your original anxiety because your brain stops making GABA when you have Xanax and you need GABA to block anxiety. The other thing is alcohol adds to the Xanax effect and I know you're also cutting calories so maybe you've cut back on the drinking. Withdrawal from either of these is potentially problematic and could be causing your symptoms...