Man, listen to The Red Baron, he knows what he's talking about. I am doing what he recommended on a post of mine and it seems to be working.
I agree no girl is worth changing your life for her (unless it's a positive thing for you and you really doit for yourself) or going out of your way for her.
I had a similar situation, was "advised" several times to cool it off with my drinking, till I got drunk at her birthday and acted like a fool in front of her friends. That's when she dumped me. Also went through some of the stages you went my self (The acting soft and needy, angry message, etc). Now we talk on facebook quite regularly (trying to not overdo it) and am keeping it cool and she seems more curious and wanting to prove herself. She may be regretting what she did but I can't know that for a fact.
Anyway I'm keeping it cool and think I don't like/need her so much after all.
Sometimes even though you know the answer deep inside you are your worst advisor, especially in these situations. Give your mind a rest/break and try to stop obsessing, keep it cool and don't act needy. Try doing things you like and dating other girls or meeting new people. I know, easier said done done. If that doesn't work then almost anything will. Quit calling her for a while.
Your situation, however, seems quite complicated since there are different countries involved, trips to be made, months or years to go. Personally I wouldn't even bother unless she gets back to Aus. You need to have a clear mind in order to Win Her Back or to get other girls. I would say it's not worth it but of course you must decide. And I wouldn't go all the way to Sweden just to see her unless I had other businesses or reasons to be there.
Hope that helped.