6 months before what? Cause if it's lung cancer, I'd say goodbye and kill myself on the spot, not wanting to bother anyone with the burden of watching me get worse and worse everyday. (I say lung cancer cause I'm a smoker and otherwise healthy).
If it's because of some power out of our means, like the sun exploding, everyone would be in a state of panic, so I guess I'd just try to make sure that those that want to live their last 6 months peacefully are not bothered by annoying people that would make use of the general panic to create chaos.
Now if you go for 6 months to live, just like that, I would be fucking annoyed that my mom would loose one of her children before dying herself, loosing her husband was already really hard on her, wouldn't want her to live that. Hard to picture, because it's so unrealistic. Wouldn't a normal person try to beat the crap of whatever decided this for them arbitrarily? Like, if it's some powerful mafia boss that has decided to kill me, I'd kill him first. If it's some mysterious power, like Death itself, I would try to figure out the reason why me, then and there. If it was because I saw my futur in the cards or something as stupid as that, well, I wouldn't believe it anyway. This question is hard to answer for an ESTJ, well, at least it is for me, because it just doesn't make sense.