Hi @svac1 and welcome to this group. I'm actually surprised you didn't lose your voice. The effects of the radiation will take many months to heal (stop changing your internal structures) and even when that is all set to a new normal I think you will find your voice won't be the same. I myself was no longer able to project my voice while trying to conduct training seminars or functions which required a stage voice. It took a bit of adjustment to accept that.
Keep your port for a while if you can and avoid being around any sick folks this winter while you build your systems back up. This is going to take a while, with some issues literally years.
I wish you the best and speed in recovery. If you have questions or need to be pealed off the wall please don't hesitate to reach out.