@marthawyatt I have neuroendocrine pancreatic cancer that has spread to my liver. I have not had Y90, but I follow liver treatments for future reference. Here are two links to discussions on how others experienced Y90 treatments. Some of the comments aren't relevant to your concerns, but I think there is enough sharing from other Y90 treatment patients, that they are worth a quick look. Did you find anything valuable?
https://connect.mayoclinic.org/discussion/radioembolization-vs-y90/
https://connect.mayoclinic.org/discussion/y-90-liver-cancer-treatment/