Arte - I'm sure that if you found yourself in a stimulating environment free from child-generated distractions, you would reconnect with your intellect in an instance. (Am wishing same for myself, anyway).

In the meantime, it might be worth having a check up with your GP - anaemia can cause mental fogginess, as can insulin resistance and I'm sure other deficiencies or dietary imbalances could too. If it's something as simple as swallowing down some fish oil or iron tabs - worth investigating IMO.