6mm pineal cyst. could it be cause of constant headache and deep left eye pain? low bp 85/55,fatique, double vision, eyeball spasm, memory loss, dizzy

Not likely.: Your symptom complex encompasses neurological, cardiovascular, and potentially vestibular systems all of which may be connected. However, they cannot be attributable to a 6mm pineal gland. A thorough history and exam in person are necessary to have a chance at a diagnosis. It sounds like someone has already started the process so I suggest you continue.