shadows

I have seen a dark shadows all around my house, I see somebody going into my kitchen walking up and down the stairs, my brother has experienced some scary stuff in his room, somebody choking him and walking around his bed, I heard foot steeps in his room, I also had things just thrown around, my mom was cleaning the living room and she was hit with remote controler, that same day when i came home from work all my stuff in my room was all over the floor. I also recorded something on my tv the other day, its a male voice really deep and scary sounding that sounds like it says now go, or now no, also there is ants in my house all over and tiny little black bugs they seem to come out of nowhere. All this started when me and my mom saw what i can only describe is devil evil demon, http://www.mysticaluniverse.com/mystical_creat ... it looked like that. We were driving one night and saw it on the side of the street, it was gone in a blink.The house is not old it was build in 1986, it just has a negative feeling. There is no air and sometimes I feel like I can not breath, I get cold sweats every morning at 4am.What is going on can somebody give me any answers?