Bananas are one of the worst foods if you truly have candida problems like you claim. They are very high in starch/sugars.
holysin on this forum says he eats an enormous amount of bananas, he claims enough to get sufficient protein which I doubt. The immune reaction can be less to bananas which might be the reason.
Amino acids would provide what your body needs without causing an immune reaction. No other nutrients would be available.
Maybe you are reacting to the capsules or fillers in some supplements.
I think that you are misinterpreting what is happening in your body because to me, it seems more like an autoimmune reaction to foods. Changing foods, a food challenge to your immune system can cause initial problems which die down if the foods is eaten again and the immune system responds with IgE antibodies to the food. I get this myself and worked out how to get around my very high digestive permeability 20+ years ago. That does not solve it though, it only makes things easier.