Early stage:- forgetfulness, confusion, difficulty in concentrating, insomnia, depression, feeling low or anxious, inability to cope well with stress or shock.
Later stage:- panic attacks, paranoia, severe Depression and/or anxiety and very severe insomnia leading to the possibility of hallucinations especially after stress and/or insomnia.
crap, i was having all of those symptoms except hallucinating and some would argue with that!