My wife was sleeved the day before Thanksgiving and her Christmas gift was severe constipation.Per our team, she had good luck with Aloe juice and making sure she got all of her Water...
She's been fine since, but takes the Aloe every day.
Oh, and she also takes a probiotic every day - but she's done that for years and had been since the day after her surgery. So I'm pretty certain that for her it was the Aloe and making sure she has all her water.
I wish you good luck - I know it's miserable to be stopped up. In the 15 years we've been together, I've never seen her in a more foul mood...