Separation anxiety disorder (or simply separation anxiety) is a psychological condition in which an individual has excessive anxiety regarding separation from home or from people to whom the individual has a strong emotional attachment (like a mother). Even though present in all age groups, adult separation anxiety is much less common than childhood separation anxiety and usually only manifests itself as a symptom of a bigger issue . Separation anxiety is often characterized by some of the following symptoms:
Recurring distress when separated from the subject of attachment (such as the mother or home)
Persistent, excessive worrying about losing the subject of attachment
Persistent, excessive worrying that some event will lead to separation from a major attachment
Excessive fear about being alone without subject of attachment
Persistent reluctance or refusal to go to sleep without being near a major attachment figure, like a mother
Recurrent nightmares about separation
Often, separation anxiety is a symptom of a co-morbid condition. Studies show that children suffering from separation anxiety are much more likely to have ADHD, bipolar disorder, panic disorder, and others later in life

More Info & Souce:
http://en.wikipedia.org/wiki/Separat...xiety_Disorder