Codependent Personality Disorder is a dysfunctional relationship with the self characterized by living through or for another, attempts to control others, blaming others, a sense of victimization, attempts to "fix" others, and intense anxiety around intimacy. It is very common in people raised in dysfunctional families, and in the partners and children of alcoholics and addicts.  

Physical and Emotional Consequences of Codependency:

Emotional problems such as depression, anxiety, relationship dysfunctions, and cycling between hyperactivity / lethargy are evident in many codependents.

Physical problems often result from untreated codependency. These may include: gastro-intestinal disturbances, colitis, ulcers, migraine headaches, non-specific rashes and skin problems, high blood pressure, insomnia, sleep disorders, and other stress related physical illnesses. 

Read about the characteristics and symptoms of codependency.

More about Codependency:

The following excerpt from the book The Emotionally Abused Woman: Overcoming Destructive Patterns and Reclaiming Yourself gives additional information about the dilemma of codependency.  The book is by Beverly Engel, MFCC. It was published in 1990 by Ballantine Books. (Despite the gender specific terminology - this applies to both sexes.)

"The irony is that as much as a "codependent" feels responsibility for others and takes care of others, she believes deep down that other people are responsible for her. She blames others for her unhappiness and problems, and feels that it's other people's fault that she's unhappy.

Another irony is that while she feels controlled by people and events, she herself is overly controlling. She is afraid of allowing other people to be who they are and of allowing events to happen naturally.  An expert in knowing best how things should turn out and how people should behave, the codependent person tries to control others through threats, coercion, advice giving, helplessness, guilt, manipulation, or domination."