dude, i feel your pain....my second year was the worst! it sucked for so many reasons...being away from home, freinds and family just got worse, the classes were harder, the excitement had worn off, still didn't see any patients, biochem, tired of the freezing cold, realizing i was only a bit more than 20% done, biochem.....did i mention biochem? damn, i hated that class!
things do get better though. after the lag period it becomes a lot more like home. what i did (and still do) to deal with it is mainly keep in touch with family and freinds on a regular schedule. i use MSN messenger a ton. i study and use my homesickness as a motivation. the more work i get done early, the sooner i get home. also, third year is just so much more fun. you finally feel like you are in medicine, and learning things that you will use quite a bit more than the basic science stuff.
also, do some stuff that is fun where you are. i am sure it can't be too tough to enjoy australia. i would love to be near a beach right now! enjoy it while you can, cause as much as you want to be home, you will look back on these days with fondness. give yourself something to remember!
have fun, and good luck! you will make it!