Foggy brain and insomnia – is there a reason?

Two common symptoms of multiple sclerosis are foggy brain and insomnia. Today was a bad day at work, and I have to say I am starting to get scared.

So, google is my friend. I found the following site 

could the low fat diet advocated by swank and jaliank be the problem? Could I be on the way to diabeties and hypoglycemia while trying to avoid progression of multiple sclerosis?

thoughts? Please?