Mark & Meg,
I've never been where you are as such, but 4 years ago my Son (Bruno) was diagnosed with Leukaemia when he was nearly 3. Worst day of my life. There is still a little part of me which is still numb from that day, however, that being the worst day means that every day since has been better.
He was very ill at the time of diagnosis, but the shortened version is that he finished his treatment last November and in 3 weeks time he turns 7. He (we) came through it and life is back on track.
I hope that your news isn't the news that you fear, but if it helps, the things that we felt we were able to contribute to the fight were staying positive and trying to be as 'normal' as possible, and feeding him the healthiest food possible.
The feeling of helplessness and lack of control is the resounding memory from the period, but we're the lucky ones.
That's the thing to remember, bad news is only bad news because good news exists and bad luck can only be suggested because good luck persists.
Even in the time that Bru was receiving treatment, the treatment protocol changed to the extent that the treatment is very different today to that of 4 years ago. Treatment for Cancers get better every day and they are brilliant.
Keep positive in the knowledge that you have the collective positive thought of STW with you too.
Positive thoughts and wishes,
Stu.