Bullying is persistent unwelcome behaviour, mostly using unwarranted or invalid criticism, fault-finding, exclusion, isolation, being treated differently, being shouted at, excessive monitoring and much more
Bullying has nothing to do with managing; good managers manage staff and bad managers' bully. Bullies project their inadequacy on to others to avoid facing up to their inadequacy, to avoid accepting responsibility for their behaviour and to reduce their fear of being seen for what they are. Despite a confident or self assured facade bullies have low self-confidence and low self-esteem. Low self-esteem is a factor highlighted in many studies of bullying.

Denial of the right to earn your livelihood including preventing you getting another job, usually with a bad or misleading reference

Low self-confidence
Work place bullying is a major cause of work-related stress and emotional problems. While work place bullying and harassment is an often under recognised cause of job dissatisfaction, absenteeism, and staff turnover, it also has a huge and often enduring effect on the victim. Many people continue to suffer from the emotional wounds inflicted by work place abuse of various forms, long after they have left the work place where they were originally victimised.
Bullying experiences can lead to a range of different psychological difficulties and in some cases these can persist indefinitely without psychological therapy.
Counselling for victims of work place bullying typically involves two components: (1) training in strategies to face and deal with the practical issues confronting you in the work place, and (2) strategies to manage the emotional effects of bullying.
Counselling can assist you in the decision making process about who to speak to at work if anyone, whether to stay at work, etc., and becoming assertive in situations where you feel you need to stay and cope with a situation.
Cognitive Behaviour Therapy (CBT) has been shown by many research trials to be the treatment of choice for many bullying-related emotional problems such as posttraumatic stress reactions, depression, and panic attacks.
CBT therapy for bullying-related experiences usually involves training in many different psychological techniques and typically involves some or all of the following components: training in relaxation and anxiety management skills, techniques which desensitise people to the abuse memory and reduce the frequency of intrusive thoughts, nightmares, etc., and techniques to overcome negative thinking patterns.
However each person's reaction is unique and the specific CBT counselling techniques required will depend on the person's particular difficulties
The effects of bullying can sometimes lead to Post Traumatic Stress Disorder (PTSD) symptoms. Eye Movement Desensitization and Reprocessing (EMDR) is an approach to therapy that is particularly helpful for people who have experienced something traumatic. That can be something we would normally think of as traumatizing (a sexual assault, an earthquake, a bank robbery) or an experience that was disturbing and personally traumatizing (an incident of bullying, humiliation, betrayal, complicated bereavement).
If you are involved in a distressing event such as bullying, you may feel overwhelmed and your brain may be unable to process what has happened. The distressing memory seems to become frozen on a neurological level. When you recall that memory, you can re-experience what you saw, heard, smelt, tasted or felt, and this can be quite intense. Sometimes the memories are so distressing, that the person affected tries to avoid thinking about the event to avoid experiencing the disturbing feelings.
The alternating left-right stimulation of the brain with eye movements, sounds or taps during EMDR, seems to stimulate the brain's frozen or blocked information processing system. This may be by helping to connect the cognitive/thinking areas of the brain with the more primitive emotional/feeling areas. As this processing takes place, the distressing memories of being bullied seem to lose their intensity, so that they are less disturbing and seem more like 'ordinary' memories. The effect is believed to be similar to that which occurs naturally during REM sleep (Rapid Eye Movement) when your eyes rapidly move from side to side. EMDR helps reduce the distress of all the different kinds of memories, whether it was what you saw, heard, smelt, tasted, felt or thought.