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The symptoms of being frozen with shakes could have occurred due to panic when you saw the epileptic seizures. It's not very uncommon as the scene is fearful. I would suggest that you should discuss your experience with your colleagues or friends. This will help in making your relaxed and feel better. There is no specific treatment required as of now but if you get frequent thoughts of that experience then you will require a systematic treatment from a doctor. Not to worry until then.
Do meet your doctor.
Hope this helps,
Wish you a good health
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