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Your symptoms could be suggestive of stress and anxiety.Since all the tests and reports are normal it is a good sign.The Blood pressure keeps on fluctuating throughout the day and slight variation is fine.
Take rest for few days.
Avoid stress and have adequate sleep.
Have proper meals and avoid smoking and alcohol.
You can take a Multivitamin tablet once daily for few months.
If the symptoms are bothersome consider visiting a Physician for evaluation.
Take Care!