It does sound as though you are getting logical treatment at an advanced level. But still bear in mind that perhaps one small factor, like the ingredients of your home made bread, just might make things worse during the period that you have to battle through.
It is only my unqualified opinion, but I think there has to be something wrong before the mind/body reacts to otherwise normal foods. It's almost as though these types of reaction become learned, and all the subsequent problems stem from the mind's perception of danger.
I have a son that publishes on mind / body interactions, but I never quote him for fear of making a mistake in my interpretation of his work. I do however, get to read through numerous books at the heavy end of the science. It's astonishing just how clearly a reaction at cellular level can be seen to change by suggestion alone.
I hope you'll keep us posted on your further diagnostics.
good luck. LR