I finished radiation a little less than a year ago. Still very emotional.
I also cried during my life after cancer workshop too. Any emotional film I see I cry, I cried all through Hidden Figures even though it has nothing specifically about cancer. I can't bear to watch a tv program or film where the characters are mean or cruel. It's too upsetting.
I think while we go through the treatment we are in shock, determined to endure it, significantly affected by the drugs we take and many of us are exhausted. Once it finishes and we have more time to think and start to feel better, I suspect we finally get around to mourning what happened to us. It's painful but maybe it's a productive process in the end. I am yet to find out.