possessive

Q: Is there any ruling that someone who committed suicide or accidental brutal death or anyone purposely killed him either ways, so their soul is roaming that place and makes hurdles to the passers and if it likes someone, it possesses the body. As this is a worldly talking that a person is been killed or died in accident or suicide...and he later possessed someones body....and troubles....so is this correct.... 

Q: My question is regarding my own personality which I think is like a dual personality or I am a selfish person. I love my wife and respect her as well but when I see her speaking to family members, I feel jealous. I mean even if she is with her brothers and sisters I get upset and I get stressed. I pray five times but still my mind is at unrest. Please I need your help.