Is there a ghost or demon haunting me?

well i have seen shadows,orbs,(red and blue?),growls,i can sense darkness upon me,if "it" gets close i can feel it and it trys to control me i start to cry,get dizzy,light headed,i have heard unexplained voices like giggling,laughing,e.t.c,i hear bangs in my basement,i feel like it wants to communicate with me but i don't know if its good presence or a bad one, how can i tell? i have said a prayer and it felt like there was a barrier around me it has stopped now but what should i do? is it a ghost,spirit,demon, i just don't know at first i thought i was crazy!!,but then i told my sister and she felt them also! it's freaking me out but i keep saying"i am stronger than you" because i know they feed off of fear. today me and my sister were taking care of my other sisters baby, i am very scared that something might happen, what should i do? I know when this "thing" is in the room because...well... u know that feeling when someones behind you? well me and my sister,and my sisters baby were on the couch watching t.v and talking about my experiences with this thing to my sister,so i felt a flash of cold air go through me and i saw a shadow right next to me like it was staring at us.I then started to cry,so i asked my sister if she felt/saw it she said "yea!,i think its right there" i said yea i know.....i looked at it and closed my eyes i swear i saw the outline of it.......i'm scared but not really i just don't know what should i do please help!? last night at about 3am-7am i was petrified! i was the only one awake,both of my sisters and the baby were sleeping and i was downstairs watching t.v and playing a game on the computer and suddenly the fan falls, so i pick it up and sit back on the couch, about 10mins p and i see a orb it was blue,red,and white, by our picture frames.So that was also weird.Then i started hearing banging noises in the basement,and in the back of the house by our pantry(in the kitchen).So i got really scared after hearing that for about 10minutes and grabbed my ipod,turned off the t.v and ran upstairs. At first i thought it was like a robber so i hid in the bathroom. I was sitting on the floor in the bathroom and i heard like laughing,and talking,and i still heard the noises. I was to terrified to even open the bathroom door! I turned on my ipod and started to text my mom it was about 5:46am.Out of nowhere my ipod just died!,and i didn't want to run in my sister's bedroom to wake them up plus i was way to scared to open the bathroom door to escape! So minutes later i heard the phone ring i opened the bathroom door and ran to my sisters bedroom to get the phone since i knew it was my mom.So i opened the door and ran to get the phone.I got the phone and ran to my bedroom and started talking to my mom i told my mom everything she said "its okay just calm down and be strong if you have to wake up your sisters call the cops if u need to" I said okay love you bye.I hung up.it was about 6am then so it was bright out so i opened my blinds and laid down in my bed.It took till about 8am for me to fall asleep.What should i do any advice!?