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For treatment of any problem its cause should be removed. From your history it is clear that anxiety
is most probable cause of her memory loss
From symptoms severity it appear that, only lifestyle changes will not help her. She also need treatment from psychiatrist
. Sometime improvement may take time, so keep patience without stopping treatment.
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal