You're tough! I wouldn't have been happy to drive or sit all day two days after having my surgery. I guess taking time off depends on your employer too but I think most are very sympathetic.
Blaming your back is a great excuse as it's none of their business. Have you had another BM?
I use this and it's excellent:
https://www.amazon.co.uk/Xcellent-Globa ... et+sprayerI use the carry case in public and have an empty water bottle that I fill up before I think I might have a BM. I contemplated simply fill the spray bottle in public but decided it's too embarrassing. I try to use a disabled toilet if possible as I can fill the spray bottle more than once if necessary. It's far gentler on your bum than baby wipes. If you use baby wipes, have you tried WaterWipes? I found all other brands burn.