I feel, the answers given here for the situation asked are all invalid. If you know for sure that you going to die after few hours, you mental state will be totally different from it is now. As said, people can never be afraid of death as it is unknown, what we are afraid is to lose the known. In this scenario, most likely we will have 3 options, one i will be very afraid and will try to avoid it (i mean not face it) through many ways, another i might try to correct things and relations that can be corrected in this short period of time (It is also really a form of scape), the other I will be completely passive and observe how the each moment presents itself. If possible i will chose the third.