Fainting during any diet can occur from several different causes; simply not eating enough, a mineral shortage, or low blood glucose. Adding more food may be all you need since it can usually stop all of the causes above. Add just a medium amount of some type of dried beans to your diet until you feel more like checking out the bread recipes and begin eating it every day. Look at the number of carbs you’re eating and try to add to the amount simply by eating more food; 50 grams a day when starting the diet is usually sufficient. Are you eating eggs throughout the day in order to keep your protein amount up?
Kefir can be purchased as a starter kit or you can purchase the grains and make your own. I would try to find the starter kits first so that you can add more carbs to your diet asap. A lot of health food stores carry the kits, and they can also be found online. The one below is a good quality brand.