The Canadian Embassy has shut down in Cairo and pulled its' personnel. I do not think the analogy of Israel to Egypt is accurate. It is one thing to read press accounts of "imminent' threats and it is quite another to see pictures of millions of people in the streets protesting, multiple government ministers resigning and an American has already been killed in the street.
It is your vacation and your life, but it seems to me--to knowingly acknowledge that you are making yourself a prisoner in your hotel--is not a vacation I would enjoy! I understand you want to see they pyramids etc., but at what price.