Please read desc, something creepy's happening to me and I don't know what it is... - APL

Description: Imma make this quick. I had a dream, or nightmare, either one. So, I was in a dark room that looked broken and unused. Cobwebs were in literally all corners, and the floor and walls were cracked. I saw a stranger version of me walking into a wall as if something like a monster was infront of them, me, I don't know. Instead of stopping, they walked straight through it with yellow glowy stuff where they walked through. When they disappeared, I woke up and I haven't got any sleep since. Strange things have been happening asnwell. My door has opened up on it's own when I'm the only one in the house, and I swear I keep hearing someone in my back garden. Please, I'm in a state of terror, what can I do?