I don't know really know to be honest. Being confronted with your mortality is never easy but I've never been a wild person nor am I that way inclined. I'd want to spend it with the people I love the most. Maybe tell that special someone how I feel or something. Q2: Mass looting/rioting. Chaos incarnate followed by widespread anarchy. Humanity would collapse in on itself.
Q3: I imagine most would want to spread a calming message. Like trying to make people feel at peace with a hope beyond that which lies ahead. Something like that.