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I understand your concern.
do you by any chance know what your blood pressure is with these episodes? this is the most concerning thing to me, since patients typically get these symptoms with spikes of blood pressure -- unfortunately this can be tough to catch and diagnose since your blood pressure can be normal at most times. In these cases, I recommend ambulatory blood pressure monitoring which can be ordered by your physician.
The shaking is not as easy to explain and may be unrelated to the head pressure. The other concerning thing regarding head pressure is aneurysms (abnormally weak blood vessels) in the brain that can rupture and cause death. I would be most concerned about this if you have a family history of it OR if the pressure can be described as the "worst" that you have experienced in your life. This can be ruled out with CT of the head.
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