He could take both the reuteri and the Culturelle at night a few hours after his meds.
I think it would depend on when most of his discomfort is. Is it in the afternoon? In the evening?
I ate like crazy after I was diagnosed because I was soooo underweight...but pretty much stayed away from milk products considering they made me so uncomfortable. Eventually, adding them back as I felt better was OK. I'm still lactose intolerant, but at least I know what to expect.
What does he have for breakfast?
A blizzard once in a while is fine....maybe the McDonald's one is less offensive to him that other brands? Experimenting is really key.
Pizza...hit and miss with them as well...depeding on how much fat and what kind of cheese...etc.
He could possibly start a fibre supplement with meals to help bulk up the stool a bit and that in itself will possibly help some of the discomfort eventually.
The Bentylol (it's Bentyl in the US).
I think if he stays away from soft drinks....they cause the most gas and discomfort.
How much has he improved since diagnosis?