I read your question and I understand your concern.
It is a good thing that she is having a
MRI exam as well just to be thorough and exclude any brain lesions. From your description, if other common causes are being excluded, it could well be a case of
anxiety.
Regarding the treatment for starters measures like slowing a little down with her work, avoiding use of caffeine or other stimulants, regular sleeping hours are also important.
If those are not enough then it depends. If for
short periods of time benzodiazepines could be used but not for long because they cause dependency and tolerance. If it seems like a chronic problem then antidepressants are more indicated. Both groups should be prescribed by a physician after discussing their side effects.
That is only after other causes are excluded though. I supposed routine blood tests have been done since we are at the point of a specialized exam like MRI,
thyroid function exams should be done as well.
I hope to have been of help.