While there are common risk factors that increase the likelihood of getting cancer, there are many of us who were otherwise healthy and found themselves having to deal with this horrible disease. I never smoked, didn't drink all that much and am a competitive dragonboat paddler. Actually qualified to go to the world championships this year but had to leave the team (temporaily) because of my surgery (partial glossectomy, wrist flap, skin graft from thigh, etc.), recovery and radiation treatments. I'm back on track to race competitively again next season, with my spanky new tongue and fancy wrist scar.
It sounds like you are getting a team of doctors together, so that's about all you can really do. Make sure you get the best treatment available to you, and the rest is in their court to do their best to fix you up. Easier said than done, but try not to let your mind dwell on it and worry constantly - this will not benefit you at all. I know it's really scary, but you've taken steps to get on the right path to get rid of whatever baddies you have growing in there.