Hello and thanks for writing in
As per the symptoms you have explained you must investigated for Cervical Spodylosis and Arteriosclerotic vascular disease
. It might be an attacks of TIA
in which blood supply to the brain reduces for and interval and than restores again. Lipitor
has a side effects on liver
function it does not cause any weakness.
Consult your physician and get your X-ray C spine and color Doppler of carotid arteries done. This help you to rule the disease.
Hope I have answered your question.