I don't have the answer you are looking for, but I just want to say that Bernstein says in his book that infections (even minor ones, like infections under a tooth) will cause a substantial rise in blood sugar. Also, I wonder if you might still be having liver dumps. Once you start a low-carbohydrate diet, the liver dumps can continue for weeks, causing BS numbers that are much higher than you might expect.
I don't know much about ME/CFS, but based on what I just read, it sounds like that could be the cause.
Do you mind if I propose a different approach? Spend 5-10 minutes every day visualizing yourself being perfectly healthy, feeling good and doing things which ME/CFS doesn't usually allow. The mind has great healing power.