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Hi there ....
It is highly likely that you have underlying depressive illness and symptoms that you mentioned are because of depression /anxiety .
First system that is effected in depression is stomach and intestine , nausea ,vomiting , loss of appetite followed by lack of sleep ,lack of energy all are because of depression .
It would be ideal for you to have consultation with Psychiatrist , this will help you out .
Regards ***** ***** luck .
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