I totally understand your concern. I went through the same radiation last year but no surgery. I completed my radiation treatments early May of 23. I went back to work mid May. Same issues, couldn’t swallow with out pain, still on pain meds, and dealing with wondering if it would ever go away or my life return to some normality. It took me several month to gradually get better. By Christmas I was about 85%.. A year later, May of 24 I am very close to full energy, pain free, and plenty of energy to work. I am 68.
I want to encourage you that you will recover. I understand you tire much sooner than before, so rest as you need to. There is a line in Psalm 138 that says the Lord will perfect all that concerns you. My key is write down all those concerns and give them to Him. You will recover.