
Headache, Nausea, Light Headedness, Chest Pressure, Sweaty Skin, Fatigue. Tests Normal. What Has Happened?

The description of worst headache in life theoretically is described in Sub Arachnoid hemorrhage (leak in the brain coverings). Since the CT scan, MRI and others are non confirmatory we can attribute this headache to the peak in the Blood pressure reading.
It is about how acutely the blood pressure rises than what is the reading. Since your recorded BP during the incident was high and an acute rise from normal reading would have caused the headache. The other symptoms that were described are consistent with this possibility. When a sudden gush of blood enters the vessels of the brain this happens. The brain is surrounded by hard skull which cannot accommodate any space for the increased flow.
The next steps to follow are monitor the blood pressure consistently. BP diary helps a lot. Though such a short rise in blood pressure in very unlikely to cause any damage, the chances of such an acute rise in the near future is high. The risk is gradually reduced over a period of time.
The reasons for an acute rise in BP are many and sometimes unexplainable. Your doctor can find out the right reason.
Let me know if I clarified your question.

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