It can feel overwhelming.
I had the initial operation followed by further surgery a week later; then a break whilst the wound healed, then a scan to make sure bones weren't affected; they weren't; discussion with the oncologist followed by daily precautionary radiation treatment. Once I got into the routine I felt less worried because I was back in control.
Have a good trip - I too didn't tell family by letter or 'phone, in fact I didn't tell family until 9-12 months after treatment by which time I was better, the prognosis was good and I didn't have to deal with their feelings! I got fed up with being brave for other people ………