I have a story that may cheer you up.
My boyfriend was diagnosed with Melanoma when he was in his teens, he ended up going for surgery and the doctors thought they removed all of the cancerous tissue he has no visible issues.
Fast-Forward several years later and he starts to get these chronic headaches, at the time he doesn't think too much of them and lives with them for a while until they become so unbearable he knows something must be up. He goes to the doctor and he learns the Melanoma has caused Brain Metastases (tumor). At this point (since he waited so long) it's a giant thing that covers quite a bit of his brain and it is in such an area that surgery is not an option. At the time they tell him that statistically speaking the median survival is 5 months WITH treatment.
So they start radiation treatment and he gets tired and feels crappy and the tumors don't seem to fading too much (for the first while he used to have the worst headaches, so bad he would pass out from the pain, seizures too and sometimes the pressure in his brain would build up so much his entire face (eyes, nose, ears EVERYTHING) would start bleeding uncontrollably). This goes on for a few months and everyone fears the worst and then he gets started on Chemo and things really seem to go downhill but then (eventually YAY!) things start to get better and the tumors start responding better to the treatment and eventually they go away entirely.
It's now been about 1 year since the tumors went away and so far it looks pretty good. He still has to go once every three months to the doctor to make sure everything's still the way it should be but the doctors tell him most re-occurrence happens within the first 6 months so we're pretty hopeful.
Don't listen to Statistics, they'll just make you depressed. All the stats were against Tim and he made it out okay. Try to think of the things you have going for you. Firstly, you're young and strong which is always a good thing. Second you've got a great support group (friends and family).
Did the doctors ever tell you what Stage the cancer is? Depending on the stage you may be better off than you think.