Sorry to hear about your situation. As Lane mentioned, at least you have an oppurtunity to spend time w family, etc. My partner was diagnosed w liver cancer awhile back & given a limited amount of time to live so I have a small idea about it (it's sooooo tough for all).
As far as the poker acc't withdrawls, I'm wondering how it's been going for you? Also, I had no idea that Cake's min. withdrawl is $500?!?!?! THat seems HUGE!!!!! (I'm glad I haven't deposited on there.. or play on there either). It would seem then that it's almost like playing with monopoly money then for play in the micros (what a shame that is).
I'm not sure if there are player-to-player transfers on Cake? (if there is now I don't think there was awhile back as a buddy of mine had won some $'s on there & wanted to trade it for Fulltilt $'s,.. he & a friend of his opened up a HU cash table and he proceeded to donk off his roll to his buddy, while doing cash transfers on Fulltilt at the same time).
If possible, maybe you could try doing some trades with friends on other sites so that you can get the majority of your money on just one site & then withdrawl from there? I know you don't know me at all but I'd be happy to help you do some small trades if it'd help you out at all (I'm always into buying $'s on Fulltilt, but would buy Pokerstars
Hope you're able to work something out & again so sorry to hear about your current situation.