First couple dozen rounds of radiation weren't an issue.
Went to work as usual.
Last handful of treatments had my head in pain and lost the physical power to work 8 hours. Took a month off then went back to work.
The pain is sill difficult to navigate at work. But, insert Advil or Tylenol or Tramadol + resting for a few minutes (all while taking on more fluids) makes it more bearable.