What's causing my anxiety?

Ok so first my anxiety really elevated after an event where my dad told me something terribly scary about my room and how someone was doing magic in it. Ever since then my anxiety has gone through the roof. I remember the first 2 wks I was scared of my room like I was scared of the area where the magic happened and I would ask to sleep somewhere else. I would get like anxiety attacks in my bed. I would tell my mom that something scary was there when really there was nothing and I would check constantly to see if that scary thing was there. I would have intrusive scary thoughts of that area in my room. I lost that fear but now the anxiety just sticks with me all the time. Ever since then I have not been the same.