Pretty much all oil of oregano extracts are OK for your treatment; there are some that contain higher amounts of carivicol (might be mispell) and this is what you want.
Considering that you took antifungals the same day you were eating bread; I would assume that the antifungals caused the unusual stools that you experienced. Antifungals kill candida which is then passed on through the bowel and basically and can make your stools not very well formed, eventually this will normalize. When I started antifungals I had diarrhea for about 2 weeks before it stopped.
Antifungals can cause diarrhea in other words.
I would not eat barley grass powder or wheat grass. There really isn’t many protein products you can take; I would consider checking out teff or flax seed as alternatives.