some might not agree with my post, or believe it.. but often times what ur describing is also associated with spirits...
i have experienced i, as well as some of my family members..(we lived next door to a new age with who didnt like us very much) many people dont believe that it is true or can happen.. but i've seen it and i've even got footage/ still images, accidently caught on camera of spirits surrounding my brothers girlfriend.. it's scary...
but it's important to remember that not all spirits are evil or intend to harm you.. sometimes they are just wanting to make contact.. but if you feel unsafe or threatened by them in any way.. whatever ur religion is.. i would pray to your God,for them to leave you alone...