struggling !!!!

i need help, im new to this so sorry in advance for the full on 

my dad was diagnised 3 weeks ago today with liver cancer and since then everything has stood still he's had a ct scan 3 wekk ago yesterday had a mri scan 2 weeks ago wed and had a pet scan last tuesday and no-one seems to be giving us any information, has any one any insite as to how long this should be takening it seems we've been given this bomb shell and left with more questions than answers.

Also he had colon cancer five years ago that was successfully removed via surgery this is where the doctors seem to think that the liver cancer has come rom now my question is why was't he offered a one off prevetative chemo to prevent this!11