My good eneluv and husband, (said Agnes earlier),
I'm so sorry you had such an unfortunate surgical outcome. Except for being a nearly-retired physician (Anesthesiologist), I'm not anything but a pretty experienced enema player after about 40 years of loving them. I'd recommend to not use a typical butt plug unless it's one of the ones I've read about here that is so soft it literally expands after passing by your sphincter.
Rather, do what many including me do and spend the money for a DoubleBalloonCatheter (mine's latex, silicone available) that you insert rectally and then literally inflate with the desired/needed number of pumps inside you to block the water exiting. The external balloon also gets inflated, frequently to larger than your internal one, to pull on your cheeks and help seal your inner inflated balloon inside against your internal sphincter.
For me, even with a double balloon seal, which I adore feeling, with or without an enema flowing, it may take you a couple or few trials of insertion and inflation and positioning to get the hang of it. I use it almost daily, and during particularly intense low rectal urges to push, I need to sometimes push the outer balloon in against my sphincter as well as very consciously relax my sphincter to be sure of a perfect non-leaking seal. You'll figure it out - don't worry. It's a bit expensive but for we enema lovers, absolutely worth having. If you want the link to where I bought mine recently (actually an American Vet supply company for best price) I'd be very happy to send it you you here or in PM.
I hope you can resume loving your enemas and play with your husband for many years to come.