There's a massive upside to your story: you lived to tell. It's surprisingly easy to get into life-threatening trouble in remote Australia, and the combination broken-down car and a lingering medical condition is a recipe for disaster. Of course, the money sucks, but as a CompSci major it's not a hole you can't get out of.
Grab a beer, celebrate the fact you're still around, and try not to worry about the rest too much. Good luck!
Ask long as you recover from your illness, get it in perspective and start fighting the fights life will be giving you from here. Man up. Good luck.
The bills will pass, your bank account and health will recover, and good things will happen in good time. Just keep putting one foot in front of the other as best you can.
You got the opposite of the vacation you needed, so make sure to get your relaxation in some other way. Australia has great nature not far away from where you are, wherever you are.
Good luck.
Thanks everyone for the encouragement and kind words. Just the fact that I got to vent my issues and have some people listen and care has been great.