Behave like being possessed by ghost when over depressed?

Thought disturbance: The presence of distorted or delusional thoughts with severe depression often means that the choice of medication is different. It needs to include anti-psychotic components. Also, I'd urge you to consider a good psychotherapist to help you manage your reaction to these thoughts/feelings. I hope this helps. Best wishes!

It depends, yes you: can behave differently when depressed. But possessed you would act different and be scared of the actual entity inhabiting you. Its less funny and more serious than you think. See a medium or spiritual counselor if you think you are dealing with a negative spirit. That is very different from being depressed. I specialize in this area. I know.