Our expert says:
This can be caused by traumatic experiences, high stress, but it is also something that can run in a family and be caused by imbalances of brain hormones. Smoking won’t really aggravate this.
If you are talking about feeling “overwhelmed” it could also be depression which is caused by neurotransmitter imbalances in the brain. You can do some self testing on this website to get a better idea: http://drhansdreyer.com/questionnaire.php
Do the depression and mood disorder ones.
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