I got the results of last month's biopsy through last week, and the good news is that (for now, at least) the chemo has been successful at beating down my Leukaemia. My immune system will take a while to recover fully, but it's much better than it used to be, and all I need to do for the foreseeable future is have quarterly tests to watch out for its recurrence. There's a small chance it will come back again at some point in the future (though whether that's five or ten years away they can't say for sure), and I should be able to go through the same treatment process again in order to treat it.
So for now, at least, I can stop worrying and get back to where I left off in life, and enjoy however much of it I have left. Onwards and upwards towards a happier 2009!