My oncologist says that my gastrointestinal issues are nothing to worry about. Accordingly, I have told my inner hypochondriac to stand down.
He also said that my liver functions are now normal (repeating himself for emphasis and to make sure I grasped the import of this).
He told me that last Friday's ultrasound revealed that the fluid buildup in my liver is now gone, which is the reason that my abdomen no longer seems to be as swollen (a quick physical exam confirmed this. My abdomen is no longer hard, one side of my liver is normal and the other is much less swollen than it was). He called it a "dramatic improvement."
What the ultrasound did not reveal was any sign that my tumours are shrinking. I do feel a bit disappointed but it is early days yet, and all other signs are that the treatment is working.
As Maria said in the comments, "it really is a fight," but, for the moment, the forces of good seem to have the upper hand.