Here are some ideas:
Can you tolerate amino acids in meat? If so, bone broth/gelatin is a natural source of glutamine. You can make your own bone broth:
How to make homemade bone broth
And/or you can also use gelatin from grassfed animals in a pinch:
Great Lakes Gelatin (note:
the company addresses glutamate concerns here)
GAPs intro diet short term to starve candida.
Digestive enzymes with every meal.
Therapeutic levels of probiotics - check the cooler section of a natural food store and look for something with 50-100 billion active cultures. You can get the probiotics in fermented foods like plain yogurt and kefir (avoid the sweetened kinds), sauerkraut with active cultures (Bubbie's brand - again cooler section and usually only at natural food stores).
Arabinogalatan powder or capsules (taken with probiotics, it helps feed the good bacteria the probiotic is providing)
Vitamin C (ideally liposomal for better absorption)
DGL powder or capsules
Marshmallow root caps
Aloe caps
Hope this helps!