Paranoia
Paranoid Personality Disorder includes a pattern of distrust and suspiciousness in others. These individuals are preoccupied with doubts about people's motives, have a difficult time trusting others and often look for the 'real' motive behind behavior. They may read into benign remarks, be rigid in their views and quite unforgiving of the behavior of others. Intimacy is difficult as they may be diligent in checking up on their spouse or friends, seeking to expose their infidelity and therefore confirm their suspicions.
To treat paranoia, the combination approach of medications and therapy are often used. In terms of medications, those prescription drugs found useful in treating schizophrenia are commonly prescribed, and found to be successful, in the paranoid patient; Haldol, Risperdal and Clozaril, to name a few.
Sometimes paranoia can stop you from trusting people you've known all your life. And you can feel a lot of emotions about that: guilt, anger and resentment. When you really need an outlet for your emotions and you can't talk to anyone, write them in a diary. Diaries are a great way to let out your emotions in a calm way and as long as you keep your diary hidden, your secrets will always be safe.
See Peace.