If you are having IBS symptoms I would encourage you to check into candida and/or the specific carbohydrate diet. I don't know as much about the SCDiet, but I know a lot of people have success with it. Also, if you can find a functional medicine Doctor or some kind of natural Doctor, that might help too. Like mom24es says: Perseverance is a MUST! I too started out tradition GF, then went grain free and am now on a candida diet which has help with weight loss and many other issues. My doctor has put on many supplements to help with the diarrhea from colitis. I too have leaky gut syndrome, which is a longer row to hoe, but we can do it! (with that perseverance)
Good luck Laura and don't give up!