Corn is starchy... so if NSD works for you, it may not be you are allergic, but rather cannot digest all the starch.
When I first started NSD I thought corn was safe... after I had been on diet I had couple meals with corn and all the aches came back.. it was then I discovered corn was starchy.
Curious if you use probiotics or probiotic food to help heal the intestines. I have been over a 15 years now with probiotics and it has helped me to handle some starch now on occasion.
Best to you,
AS may win some battles, but I will win the war.
KONK - Keep ON Kicking