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That is a a neurocardiogenic attack also known as vasovagal attack.
THis can occur with intense emotional or stressful viewing, any sudden stress practically.
This can result in the drop in blood pressure, increased pulse rate for sometime before heart resumes normal functioning.
Usually not concerning.
But sometimes, this can be due to the underlying heart condition like myocardial infarction.
Hence, a clinical evaluation by your doctor is recommended.
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This could have been a heart attack or a heart arrhythmia. Your heart needs a full check before we call it anything else.
I would get to ER now for this. It is important to have it looked at right away