I was thinking of that particular NIGHT GALLERY episode when I read this!
Lawrence Harvey was excellent in that.
According to the link, he was fighting Stomach Cancer at the time (he died the next year), and he stopped taking his Pain Meds for the scenes where he was writhing in pain more realistic. THAT was a Man dedicated to his Craft.
Anyone who didn’t wince watching that Episode and then checking their Pillow before going to Bed is tougher than me. LOL