Swinging between D and C is also not uncommon for IBDers. Did you try any of the standard SCD™ advice for C, such as stewed prunes, or reduced down prune Juice w/legal orange juice after breakfast? Glycerin suppositories? 1 pint warm water +teaspoon salt in an enema?

People have also been recently writing in about increasing magnesium intake to help C symptoms.

I had all your symptoms except insomnia. In my experience, the low energy and exhaustion after starting the diet lasted about a month. Part of the issue, for me, was learning how to eat correctly on the SCD™. Have your read the recent posts on hypoglycemia/low blood sugar? In the beginning especially, you simply cannot allow yourself to become too hungry.

If my blood sugar went too low due to too long between meals, I would indeed feel exhausted, lethargic, irritable. I thought that eating sweet stuff would help--honey sweetened things or nuts and dried fruit--but really I needed to mix that with protein and fat. Now when I start to get hungry I have some cheese, or whole milk SCD™ yoghurt and cooked fruit compote, then prepare a full meal without too much delay. This works for me.