1 Corinthians 6:19-20 "What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own? For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God's."
If your body is the temple of the Holy Ghost, can demons reside in it? Can demons reside where light is? No, Darkness flees from light. Demons have no power over our spirit because it was bought by the blood of Jesus and it belongs to him and it is redeemed and clean. Now, our flesh hasn't been redeemed yet, that will happen at the last trump.
1 Corinthians 15:52 "In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed."
Your flesh which is not redeemed is being tempted and you're giving in, either it's because you haven't given that anger to the Lord or it's because you have a disorder and need some medical help, which you should not feel ashamed of if true. Some people have Anger disorders where they just can't control themselves without medicine, those are real, caused by your brain not creating the correct amount of certain chemicals in your brain. Pray to the Lord, ask him what's going on but keep in mind the things that it could be. It could be a psychiatric disorder or it could just be that you're giving in to your flesh and you need to give your anger to Jesus.
1 Peter 5:6-7 "Humble yourselves therefore under the mighty hand of God, that he may exalt you in due time: Casting all your care upon him; for he careth for you"