David,
Good luck today.
Post-surgery I was worried about constipation issues too. Right after surgery they got me on Colace which I took until the cath came out. Not to be gross but, I remember that first time after the surgery it was maybe a day or two after. My wife who had recently had a baby similar muscle stuff) told me to relax facial/mouth muscles as it is tied to sphincter muscles. Don’t know if this helps at all.
Oh yeah…stay hydrated.
Good luck to you David.
c