my father is currently suffering from major memory loss,repeats questions numerous times,talking about the past,forgetting he has been retired for ten years? confused driving/directions. as a family we are very worried.he has hasd immense stress recently...could this be a factor or does it appear to be more serious? he has been tto the doctors who prescribed anti-depressants,they made him feel awful so has stopped taking them. he also is waiting for a brain scan at the neurologists to see if anything shows up?