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Kindly get him to a Doctor to rule out high Blood pressure
and also look for what is causing it. Palpitations at rest is no issue to be taken for granted. He needs to stay off smoking and alcohol as it could be dangerous for him. Anxiety can also explain the symptoms but if it is recent with headaches
it could point to existing pathology. How is his vision, does he sweat a lot, any tingling
. If needed he needs to stay away from performing till he can get to a Doctor.