Hi Antoinette
I was 39 as well when I was diagnosed with MM. I am now 44 and feel strong and generally fine. I have had cdt, transplant etc and know that there are lots of current treatments and emerging ones available now that weren't there five years ago. I too had a child who was young, but now she is five years older than at diagnosis.
It's a shock to get diagnosed and it will take time to get your head around it. The best way to get the better of it is to focus on fighting it. As difficult as it is to stop feeling sad, guilty etc you need to try to keep positive and know that in a few years time even more treatments will be available.
Don't lose heart and focus on each day as it comes and before too long you will be looking back glad the treatment is over and appreciating the days to come.
Andrew