I'm also really, really sorry to hear about this. When I first saw the topic, last night, the first words to go through my head were literally "Oh fuck! Shit!!" I held off in posting until today, as there are honestly no words to properly say what everyone here is probably thinking at the moment.
I'm really sorry to hear about this misfortune, and I just feel really horrible as well. I cannot imagine how it must feel, the combination of frustration and disappointment about your Japan trip, combined with now being stranded in Sweden on your friend's couch, due to tying things up for the Japan trip. And that is before we even think about the health situation. All in all, it is a really lousy situation, and I would never wish it upon anyone.
From what you mentioned in the original post, it seems as though you caught things early enough as to have nipped it in the bud. Is this correct? Did the doctors have any idea as to how you got this sort of cancer? My mother had cancer (and chemo) about a year or two ago, and it was honestly one of the roughest periods of my life, being a world away from her and seeing her (via skype) becoming weak and helpless due to the chemo. Luckily she was able to become a survivor.
Look: If you want to chat about anything, or vent about anything, please just shoot me a PM at anytime. Even if you got everything taken care of, cancer wise, I am sure there will be a lot of frustrations due to the whole situation as a whole. If this happened to me, I know I would be feeling bitter and upset by the ordeal.
So I hope things turn out for the best, and please let us know any updates, as everyone here at FW cares about you and is hoping for the best. And if you want to chat, please just let me know!