@Simonw What does your GI think? You could have pouchitis, but the symptoms are unusual for that. I’m wondering why you’re still taking any Lomotil at all - do you have *any* symptoms at this point that Lomotil is intended to treat?
Antibiotics often thicken the stool. I’d be surprised if they fixed up your bloated/full feeling, but surprising things happen all the time. I’d try stopping the Lomotil, first, just to see how your baseline functioning is right now.