Demonic disturbances... is there any advice anybody could lend me?

From when I was just a toddler (maybe about 3-4 years old), I could remember this one particular and repetitive nightmare. Upon waking up from it, I'd be terrified. Then I'd hear noises. (sounded like something heavy being dragged on the carpet floor.) It'd all end up w/ me crying til my mother came into the room. Anyhow, this goes on for nights and nights and nights til one night upon waking up from the same repetitive nightmare, I saw the entity of what has been haunting me. I was petrified. I wouldn't cry out. I didn't have the nerve to even move, but rather just to look it in the eye. It definitely wasn't human. There's no question at all whether it was a demon or not. However, since my family and I moved out and into a different apartment, I haven't encountered these disturbances time being into that new apartment. Years past on, then we moved out and moved into a house. As time flew, I have pretty much forgotten about that experience I had as a toddler that one night in that apartment. I was maybe about 10-11 years old when it happened again in the house we were living in. I heard that same noise (something heavy being dragged on the carpet floor). I was so frightened remembering the same experience years ago. I cried til my father came into the room. At that age, I didn't really know how to explain what was bothering me. At that time, I thought I'd only be thought as crazy. Maybe I am crazy. However, I'm 20 years old now and now I'm stationed in Korea. At night, only when I go to bed, I hear noises. Not those same noises I was talkin about, but just like as if there's something tapping on the counter, on the walls, and sometimes on the door. I actually got up once to answer the door because I thought someone was at the door. I'm very scared that I'll start hearing those same noises again from that apartment. To me it just seems like no matter where I go, even if it's across the globe, there'll always be something w/ me. Something's watching over me and is just waiting at the perfect time to strike again. Every night, I pray to God when my heart's racing and it calms me. The thing is, it's that every night, I absolutely have to pray to God in order for what ever I may think is w/ me to go away. It won't go away all together and forever. Is there anything anyone can advise to extract this this complication from my life? Or am I just crazy and I should probably go see a doctor?