My Cat Is Terrified Of My Bedroom

So I just bought a house not too long ago, back in November and I moved in. I've been pagan since I was about twelve so when strange things started happening around my new place in January I didn't really think much of it. I'm used to the ideas of spirits and ghosts that are still lost on our plain.

I just got a cat about a week back and he's really quiet, very laid back and lazy until I try to take him anywhere near the master bedroom, the one I sleep in. He growls and hisses, trying to get away and as soon as I let go he runs away and then just stands in the middle of the hallway. He hisses at the door and poofs himself up to make himself look bigger, like he's being threatened by something. I have to admit, the room is always a couple degrees colder than the rest of the house. No matter how hot it is in the hall or the kitchen and living room, the bedroom stays about the same temperature.

I was on my computer yesterday, it's in the corner of the living room on a little desk. I face the wall with the kitchen and hallway on my left and the front window on my right usually. Yesterday I was getting a bit cramped and turned in the chair to sit sideways, facing toward the kitchen. I was writing on my computer and playing loud music through my headphones. I saw something move in the hallway, but I ignored it, thinking it was the cat until he stood up on the couch and stretched. That same thing was in the hall and it was dark, so I couldn't really see. I don't know why, but I didn't want to get up and walk across the living room and kitchen to turn on the hall light. Something told me I would be getting too close. I sat there on the chair, staring down the hall and I noticed my cat was watching too. He had his ears laid back and his tail was twitching like something was aggravating him.

Like I said before, I'm pagan so I know that cats can see what I can't. I know that he knows there's something here with us, I'm just not sure if it's dangerous or not. Would he be acting in such a way if the entity wasn't harmful, or does he feel threatened because it's malicious? I was living here for almost four months before I got the cat and I never felt threatened until now. I don't even want to go into my own bedroom anymore.

I'm not about to try a seance by myself, I'm afraid it could be dangerous and I don't know anyone around where I live who would help me with that. I just want this thing gone. Even though it's doesn't seem to be a threat to me, I have a feeling it doesn't like the cat. Should I get rid of him, or is it the cat that's keeping it at bay? As long as the cat's around I feel safe. I don't know what to do, or what this thing could be, I just know it's moving further into the house.