My mother (82 years old) is suffering from grief and depression following the death of my father last June.  She has recently described the "feeling in her head" as she puts it as feeling like being "out of her body". 

She has repeated episodes when she thinks it is last June, and dad has just passed away a few days ago, as if she keeps moving back and forth in time.  She also sometimes has episodes when she says she "just saw him a minute ago sitting on the couch". 

Her doctors, (she has many now!) have diagnosed it as dementia brought on by depression, and they are treating her with anti-depressants.

Is there anyone here who might have any thought on what is happening to my Mom?  Do you think she is traveling? 

Thanks for any advice.