I started reading Dr Duane Graveline's book 'Statin Drugs Side Effects and the Misguided War on Cholesterol'. He is one of 'ours', being a Flight Surgeon (USAF ret) and Astronaut-scientist (NASA Ret) as well as a family doctor. Cholesterol is what makes your brain and memory function. You might loose your medical very quickly if you have some of the side-effects he describes and suffered himself. Red Yeast Rice will have the same cholesterol-lowering effect but with no side-effects, if you think that cholesterol must be lowered for any reason.
I stopped taking simvastatin a year ago, I couldn't remember all the digits of a frequency given by ATC anymore, it was like one of the digits 'dropped into a hole' (short term memory lapse). The fog has now cleared and being clear of statins I am ready for more ATC frequencies and waypoints.
If I would have mentioned this memory problem to a GP he would have said it is old age and never connected it to statins.