@ mabeT- Howdy! You really need to get that boy to sit down and take it easy. A wound reopening is not a fun thing in any way, shape or form.
Are you in a position to help him with the things that he feels are so important? Can you arrange for someone else to do so?
Explain to him that if he will just sit on his butt until the doctor says it is okay to get up, he will get well faster.
After a wound has opened back up, you’re back at square one, baby. Maybe you should look up some dehiscenece wound pictures for him to take a gander at! That's bound to get him back in the recliner!
Good luck with your stubborn man!