We have a saying that it’s ok if you forget where the keys are all the time. When you don’t know what the key is for though there is a problem.
Try taking the supplement Pycnogenol. It's been the object of several medical studies. Good for your vascular system and oxygenation of the brain. I've been taking it for years as it helps keep blood sugars from spiking and dropping radically. I'm hypoglycemic and haven't had a situation where I've started shaking when my blood sugar drops since I started taking it. My memory is great now and it seems to help me with that feeling that my brain is in a fog.
I think I may be drawing from this reserve "thing", pushing other memories to the back of the shelf. These "lost memories" seem to be recoverable...but it's almost like I have refiled them elsewhere and have to "research" their whereabouts.