The first thing you need to do in order to heal leaky gut is you need to reduce the inflammation of the gut. This is done via an anti-inflammatory organic diet with lots of veggies and other foods such as blueberries, salmon, broccoli, pumpkin, cinnamon, etc. You also need to remove all the things that inflame the gut from your diet such as caffeine (coffee), smoking, processed foods, gmo foods, sugar, etc. I am unsure if you can reduce the inflammation effectively while eating a non-organic diet.
You’ll also need to get supplements which heal the gut and reduce inflammation. A great supplement that reduces inflammation is (fermented) cod liver oil which is like 100x more anti-inflammatory than just eating salmon or other foods by themselves. Other leaky gut supplements include L-glutamine, digestive enzymes, Swedish or other bitters, SF722, cinnamon, inulin (aka FOS), and more (much larger list).
You’ll also need to change the characteristics of the gut or the flora that lives within it. Candida has grown over all of the other flora, so your bodies natural defenses are suppressed. Antifungals, probiotics, prebiotics all change the flora of the gut and it takes a very long time to reverse what is living there. You could also have other bacterium that has overgrown include h.pylori, ecoli, or parasites. Prebiotics, probiotics, and antifungals are effective in getting these to healthy levels.
Have you started to feel better once you’ve been on the diet? What supplements are you taking currently? Are you eating other things not on ables food list such as rice or corn?
As far as being allergic to everything; I was this way and so were many others. You need to eat anti-inflammatory foods and foods that promote the healthy gut flora (essentially able’s foods list); but the diet alone won’t cure you because you need it in conjunction with all of the supplements. The supplements are the x-factor while on the diet, and if you are not taking the correct ones, your treatment will not go as good you have hoped. A naturopathic doctor can tailor a list of these supplements and adjust them as you get better. I also highly recommend acupuncture which can heal individual organs and detox the body by itself.