I have a family member that became dependent on xanax. After almost a year of being off the drug, she is experiencing weakness, jittery feelings, shaking of her hands, memory lapses, and depression. Could these still be withdrawal symptoms after this length of time off the drug? She has taken some kind of depressant/anti depressant for at least the last 30 years. Could these have done permanent damage to her brain functions thereby resulting in her present symptoms? She has had a battery of tests(mri, etc) and nothing else has been found.