Are these signs of anxiety attacks?

So sometimes I freak out over the smallest things. I wake up in the middle of the night and hear and see things, I can swear they were there but when I get a closer look it's just blackness. My friend and her entire family says their house is haunted, and they have tons if stories to back it up. I don't believe in ghosts but now I'm not so sure. I end up totally freaking out, sweating, trembling, breathing fast. I also wake up frequently in the middle of the night thinking there is a spider on my pillow or in my room. Wherever I go, I find myself looking in corners, or under chairs and beds for any sign of a spider. I once saw one on my leg so I stood up and freaked out, but it wasn't there and none of my friends saw it, even though it was huge, so was I hallucinating? Please help me, I don't know if this is normal or not. Thanks.