Please note that my expertise is outside biology though I have great deal of interest in it. Anxiety from what I have read and experienced can be caused by demyelination. Myelin is an insulating/protective layer around nerve fibre which promots efficient conduction of signals. When you feel very anxious, please check with your doctor if taking an over the counter Vitamin B12 supplement would help. A search for 'demyelination anxiety' and 'vitamin b12 demyelination' will provide relevant resources. My Vitamin B12 reached 66 (normal range is 200 - 600) a few months ago, a point in time when I was very easily perturbed. After starting on methylcobalamin injections, I feel more composed and can withstand more chaos than I used to.