My husband and I feel a presence in our apartment. Help please?

We moved into our apartment about 5 months ago. For the first month, nothing really happened, but then I started to feel a type of presence. I can't explain it any better than to say it felt as if someone was in the room with me, but when I would turn, there was no one visibly there. This was also around the time I got pregnant. I would especially feel the presence in our bathroom. My fiance blew it off as my pregnancy hormones, but I think it's something more. Not long after I started feeling this, my 2 year old son started talking to thin air. He would stare at one place, chatting away, often waving and saying "hi". If I asked him who he was talking to, he would just point. A few random things would happen on occasion. One night, our computer was in sleep mode on the desk in our room, and all the sudden loud noise came from the speakers. It was loud enough to wake our son, and both of us. My husband ran over and shut it off. Sometimes, our pictures will be hanging crookedly, even if they were fine before. And throughout all this I have had the distinct feeling that something is there. But none of this was enough to convince my husand. Last night, however, both of us were convinced that there is something here. We were laying in bed. I had woken up for some reason and I felt that presence like someone was standing close to our bed. I woke my husband up, and he said he didn't really feel anything and fell back asleep. I tried to as well, but our son woke up and got into our bed. He quickly went back to sleep and I layed awake. All of the sudden I felt as if I were paralyzed. I couldn't move, I couldn't speak, I'm not even sure if I was breathing. But my eyes were wide open and I could see this thing at the end of our bed. I say thing because I'm not sure what to call it. it was like a shadowy thing, with no corporeal body. It didn't extend all the way to the floor either. I would say it was an orb, but there was no light within it. It was moving back and forth between the end of our bed and our closet door. All this time I couldn't move, and I couldn't speak. I was very terrified however, because it didn't feel like a good presence. It seemed to come very close to me and then rapidly disappeared. At that exact moment, I came out of my paralysis and I screamed. My husband had been awake as well, and immediately grabbed me. He said that he tried to move me and speak to me but I was like frozen where I was laying. He asked me if I had felt it too, and I recounted the experience. About that time our speakers to our computer (which was again in sleep mode) started to blare music, which was weird because we had no music programs on or opened before we went to bed. My husband turned it off and neither of us could sleep the rest of the night. I have never really been into ghosts, and have in fact been scared of them. Is there anything we can do? I am a devout Catholic and have tried praying throughout the house, and reading various scriptures. Nothing has seemed to help. I don't really want to call a priest for a full scale exorcism, if that is not necessary. Any suggestions???