Symptoms mix up words, confused, forget people/items, where going, concentrate, balance, memory short/long, lost time/years. mri ok. what could cause?

Many possibilities: Even in the setting of a normal brain MRI, there are many possible causes of changes in language, memory, orientation, concentration in balance. Brain injury, deficiencies in vitamin B12 or other nutrients, sleep disturbance, medication side effects, anxiety, depression, somatoform conversion, and seizures are just a few possible explanations to explore with a neurologist or psychiatrist.