jf, i get a sense that you have a propensity for wanderlust built in to your personality. first a 2 month backpacking excursion to europe, now a desire to move to australia for medical school. it's probably time for you to move out of the nest, and focus on your own future. by all means go for it!
i don't see it so much as an escape attempt, but more as an embrace of your true need to live more spontaneously, and i get a sense you'll have no problem building a support community no matter where you go.
but remember, as they say : 'no matter where you go, there you are', so stay in touch with us, and continue to seek out others who can help you share the weight of this burden we all share.
looking forward to some good reports from you,
your brother in recovery,