'morning, Biscuits. Just another MN voice wishing you strength and everything else you need to get through this....and I'm very glad for you that Desert has seen your thread and posted: yay, Desert.
I know from a past fight with a life threatening condition (not cancer, won't bang on about it) that finding someone who can truly relate, and is out the other side, makes the world of difference. Trying to believe others understand is one thing, knowing they do is another!
I also totally get why telling people 'I may be ok but then again I'm in danger every day' is so hard. Confusing enough for us when we're trying to get our heads around something like that, communicating it to others feels impossible - but I bet, as someone else said, you're communicating very effectively, whatever it feels like.
What Desert says about standing on the shoulders of a raft of expert others is so true...when I started my treatment, I had very poor odds of beating my disease (25% tops). By the time I'd finished a year of treatment, they'd discovered new things, I'd been on a drugs trial, and the odds had changed hugely.
But, just to make you feel better about those dark pits in the night, I did not have a positive attitude about my odds, was full of fear much of the time, always prepared for the worst, and definitely did not fit the profile of 'positive thinking patient'. I still beat the odds. The moral being - just in case you're ever tempted to - never worry about worry 
Will be thinking of you daily and holding out a cyber paw.