Dont remove a lot of foods and starve yourself. I made this mistake and it further damaged my health and led to adrenal fatigue and hypothyroidism. Eat plenty of carbs/sugars, healthy fats and proteins. Eliminate foods slowly and cautiously, I would start with caseine (milk protein) and see if that helps. The reason I say this is if you starve yourself your metabolism will crash and you will get more food sensitivities such as I had
From own experience I would very much advice against following a low carb regimen for healing gut health and food allergies. It will potentially further damage your metabolism and make one even more sensitive. I would advice incorporating lots of safe starches such as white rice and root vegetables to keep metabolism high, especially for growing children.
Nut butters contain problematic antinutrients and an excess of inflammatory and thyroid-surpressing omega 6 oils. Instead I would recommend incorporating healthy fats such as butter/ghee, coconut oil, lard, tallow. Just my 2 cents