Definitely look at the web site Bex suggested!
I am on diet at present for leaky gut and candida and I know what you mean! However there are cereals and breads available that are sugar and yeast free and also almonds and brazil nuts are good for snacks. Also look carefully at labels but in NZ we have wholegrain corn thins that are quite nice with a little almond butter on them. Also rice crackers with a little goats feta cheese. The other thing I sometimes fall back on if in a hurry and hungry is whey protein drinks. You have to be careful when selecting but there are some available that do not have any sugar or artifical sweeteners but still taste nice. I think they use stevia to sweeten them.
Hope this helps a little.