Bill,
Carl had to give up coffee when he started dialysis. He would stop drinking it for a while and then try it again. Each time it really upset his stomach. And he doesn't use milk so it wasn't that.
He tested everything and finally narrowed it down to the coffee. Can't figure out why it was affecting him like that, but it did.
And he tends to nibble through dialysis. We eat dinner during his treatment nd when he is finished with that he snacks, too. Does your clinic allow snacking. You might try. If not, have a snack ready as soon as you get off. When we were in training, we had snacks waiting in the car for us.
Good luck.
Aleta