S/s: feeling like passing out only while moving eyes, light-headed/tired, mildly slurred speech, weak legs, tingly hands/face. possibilities?

General weakness w/ : Horizontal optokinetic nystagmus, a symptom which can accompany vertigo. ... "a whirling or spinning movement") is a subtype of dizziness in which a patient .... pursuit eye movement followed by a rapid saccade in the opposite direction of the movement. But your s/s more serious. Consult your MD. It could be inner ear infection or even a mild stroke. Given your age I'd opt for inner ear GO to ER