There are many such correct statements.
All mental illnesses and personality disorders will get worse with age unless you deal with them and correct them. The longer you ignore things that are unhealthy, the worse they will get. People who do not try to change their borderline thinking habits will find that those habits get more ingrained and harder to get rid of as time goes on.
Possessive personality disorder is a disorder that has no real cure. However seeing a therapist and partaking in counseling sessions may help one overcome the disorder.
The correct spelling is schizophrenia (a mental disorder, split personality).
Only in the sense that mistreatment by one of them might be related to its formation in a victim. People with narcissistic personality disorder or antisocial personality disorder (the correct name for sociopath) may be mercurial and seem to be expressing another personality, but in fact it is the real one, that they usually keep covered up with their deceptive behavior.
No, the correct statement is: That is mine.
The most common term is sociopath. However, like most catchall terms, sociopath often is used to refer to people with other personality disorders. The correct term is "antisocial personality."
personality
No, you are thinking about an affective disorder, such as a seasonal affective disorder (SAD).
To take back (or retract) a statement means to say that the statement was not correct, or is no longer correct.
Yes, that is a grammatical statement.
That is correct.
That is the correct spelling for statement (account, report).