yeast substitutes and proper measurements
There are no substitutes for yeast. What you list are not substitutes, but alternative leaveners: either actual baking powder, or a combination of baking soda and lemon juice or yogurt. The milk does not contribute to leavening at all. 

There is nothing you can do to mimic ordinary yeast or sourdough (which consists mostly of wild yeasts). If you were to use a chemical leavener in a bread recipe, everything would be wrong - the ingredients, the proportions, but most of all, the process. It will fail miserably. 

There are two classes of baked goods which are used as bread and don't contain yeast, quickbreads and unleavened breads. Quickbreads are made with chemical leaveners. Nowadays, practically nobody bakes them for use as a bread, but rather as a kind of less elegant cake. So the recipes common today are for the sweet and fruity varieties like banana bread. But if you can find a source of WWII era recipes, you'll probably find plain quickbreads without sugar, intended to be used instead of yeast breads. 

Unleavened breads don't rise, they are a class which contains things like flour tortillas and naan. They are indeed popular in the Middle East, but it is not true that "their bread still rises" - it doesn't, and it isn't intended to. You can get some amount of puffiness if you have a very hot oven, but this is impossible with electric appliances on 360 volts or below, it is done in wood ovens. And the pita still stays mostly flat, it is just somewhat airier, but it cannot be shaped as a loaf and still bake. 

I am sorry to hear about your condition, but all you can do is to search for recipes for quickbreads and flatbreads. Yeast cannot be substituted. 

There is a bit of explanation on leavening mechanisms in this question: Why are there no recipes combining both yeast and baking powder?.