Not sure what is in my house

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So i moved into my apartment about a month ago. The place is nice but at night i keep hearing tapping noises . I wake up to what sonds like some one sniffling as well. Some things will drop randomly as well. I also herd my closest door slam while i was in the living room. I went to go check it out and notice the door opened a little bit slightly. When i leave the house and come back home my dresser's are all open and my man is running. Its kind of freaking me out. I also heard my bathroom door slam really hard when i was showering. What should I do??? The fucked up thing is when i had my other girl friend the other night we were watching a movie and she felt a burning pain all over back. It got so bad she went to shower thinking something was burning her skin. When she got it we saw her back badly scratch. Here is the picture below. Any one know whats going on?