The diet I referred to is the SCD.. Specific Carbohydrate Diet. The principle is a rigid diet that starves Crohns. There are some folks here on it, and a section of the forum where you can read up on it if you like.
LDN might be an option. But, it is hard to find a doctor to prescribe it, then a pharmacy to compound it. And, the other issue is that many people who try it initially get worse before they get better.
Wish I could offer more help. All the best