Is metformin good for your brain?

I am diabetic type 2 and take statins and metformin. I am on a strict ketogenic diet, carbs < 20g/day.
I asked Dr Jason Fung on Diet Doctor the following:
When in ketosis I may be relying on gluconeogenesis to produce glucose for my brain. If the Metformin I am taking inhibits glucose formation, might this limit the amount of energy supply to the brain and produce symptoms of fuzziness and becoming light-headed?
His reply was "It's definitely possible".
A bit worrying, as I do suffer from a fuzzy head that I normally attribute to keto flu.
Has anyone heard of this sort of problem with metformin?

 

My target is 1800, I usually get just under.

 

The expert says "It's definitely possible".

 

Well, he did use the word 'definitely', he had no need to.
I have seen discussions before on ketogenic diets and whether enough glucose would be produced for the brain, which apparently can't function on ketones alone. The answer was always 'but the liver will produce sufficient glucose via gluconeogenesis', hence my worry when I saw that metformin inhibits gluconeogenesis. But I have no answer to the fact that my blood does have sugar in it as shown by my meter - I will have to check more regularly.
I also think I read somewhere that hypoglycaemia is not something that occurs in ketosis, do you know about that?

 

I have every intention of coming off both statins and metformin, that is why I have been doing a lot of research. I ask a lot of questions, but often get unhelpful answers.
My opinion is that statins reduce cholesterol, which is not good as cholesterol is actually beneficial. Also that metformin is unnecessary if I am controlling my insulin via diet.
I have a family history of heart disease, which is why the doctor put me on statins years ago, although I have no problems myself. Unfortunately, my wife insists that I don't stop either medication without speaking to my doctor; I accept she has a say in the matter. I just had a blood test so will see the doc when I have the latest results.

 

Such cynicism...
He is a doctor and he has stuck his neck out like so few others. He writes intelligently and I respect his opinion. He certainly knows more than me and my GP.

 

I originally submitted this post asking if anyone had heard of this sort of problem (fuzzy head) with metformin and ketosis.
No answers to that so far, so I'll take it as a no. Shame about all the nit-picking, but you get that on a lot of forums.

 

Thanks. Yes, I take half a teaspoon every morning. Perhaps I should increase that as the symptoms are keto flu-like.

 

Well, that's reassuring at least. So perhaps it's just keto flu after all. I am very carb sensitive, so I think it takes very little to throw me out of ketosis and this may happen accidentally. What blood ketone meter do you use, please? I use a Ketonix breath analyser, but it is not wholly satisfactory.