Our expert says:
It sounds more like a fit than a stroke to me
You can start getting epilepsy at any age, it can also be caused by temporary shortage of blood flow (oxygen) to the brain (? due to the vomiting) that can cause a fit that looks like epilepsy but is not "real epileps". I don't think the diarrhoea or vomiting triggered the fit in itself but could cause dehydration and low blood pressure that can lead to a fit.
If her BP is still low I would stop the BP tablets temporarily.
I am worried that the Gp does not know her full history and tablets but needs to make decisions about further treatment - I think you should talk to him and give him some background.
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