What is spirit power in human body

What is spirit power in human body. The Evil Spirit. (The Aatma).

I am Human, suffering with evil spirit.

The Spirit i am suffering from, it controls my mind and body. What ever it says am always depressed and makes me do it.

This kind of Spirit put and makes you think of your happiness and sadness. I mean 1 happiness & 10 sadness.

It always makes you think of Nothing in life and make yourself to kill and stab to death.

How does this Spirit (The Aatma) exists here and disturb human being.

Once a human is died, his aatma leave the Body. But why is this Spirit (The Aatma) good or bad after leaving the body.

Its because of the Human Life and Stress happened within him and his Soul/Spirit (The Aatma) loves more his body.

1. If a man's life is stressful, painful and later tries to make his life better with Money, Family, Relatives and friends. But everyone betrayed him (especially the CLOSE once's). 
Finally, decided to suicide in such a place where no one can find his body.

Note: death before the time comes, stressful suicide, without confirmation and clarity of misunderstanding... this makes the Spirit (The Aatma) strong and bad. 

If the body is found and make the Spirit (The Aatma) free from the body by using your religion rituals, So the Spirit can be free from the Body Stress and pain he had felt from the body.

If body not found, or mistakenly buried, then the Spirit just look around death place, util he find mistake from the new human body and goes with him.

How do you know, you have a Spirit around you, Its very simple - What ever you think or do within 3 to 4 hour it will be opposite. 

Your body movement will be very slow even though your body is FIT and FINE. and Talking style will change. You will be speaking like someone is controlling your mind and making you speak.

Finally, after everything It makes you feel like DIE.

So, in this situation just be with someone whom you trust and warn them, I want to DIE and feeling like Dying.

You mind will be like I am OK and you will be very confident to confirm your LOVED once that you are OK. but you will fall to Die. so warn them, don't trust me until I am fully cured.