I was very much a non-believer of paranormal stuff right up until I had personal experiences about a year ago.
The first thing that creeped me out was hearing obvious noises (footsteps and heavy breathing) in our hallway at night. Though it was dark, the entire hallway was perfectly visible from our bedroom, so I'm 100% sure nothing physical was going on. It got to the point where both my girlfriend and I were scared at night. Apart from the noises we felt like we were being watched. So we had a medium my girlfriend trusted come over to cleanse our apartment.
I should add that around this time I was quite curious about the concept of astral projection, and was trying to see if I could do it.
So this medium came over and went around our apartment. She found two 'trapped' spirits, a sinister/evil presence in our spare bedroom, and something had latched itself to a cabinet my girlfriend picked up off the street years ago. There was also something she needed to speak to me about which would require special attention, but she would do a general cleansing of the apartment first. So we waited as she did her thing, sending the trapped spirits through a portal to the next place, and banishing the bad ones.
After that, she turned to me.
"You've been astral projecting in your sleep."
- "Wait what? I've been trying to do it consciously, but I wasn't aware I was doing it while sleeping."
"Well you have, and you shouldn't have tried getting into it without learning any of the basics, especially protection! Something has latched itself onto you, and I'm going to have to perform a ritual to banish it. I assume you've been feeling more down or angry than usual lately?"
I was baffled. She knew about the astral projection and her assumption about my state of mind was spot on as well. I had been feeling like there was a dark cloud in my mind since two weeks prior. I'd also gotten increasingly angry over little things at my girlfriend, and one time when I was mad at our neighbour across the street for fooling around with the stupid alarm sound of his motor scooter at night I went out on the balcony and screamed at him to fucking stop (+ a whole range of swear words) or I would come down and wreck his scooter. The intense rage and volume I produced in that moment was VERY unlike me, and it must've scared the neighbour because he never played with the alarm sound again while we lived there.
So anyway, the medium put her hands next to my head (without ever touching me mind you) and began her work. I felt warmth emanating from her hands which became more and more intense, almost hot. Meanwhile I started getting a headache and feeling intensely angry. She kept working and after saying some specific prayers related to banishing I felt a release. Something akin to being able to breathe deep again after a long period of shallow breathing. The dark cloud was gone from my head.
I felt like I'd just had some sort of exorcism, and told her as much. She told me to stop dabbling in things I don't understand yet, and learn the basics of spirituality/witchcraft before I even think to try something like astral projection again, as I was also putting my girlfriend in danger, who is a witch and therefore very sensitive to anything from the spirit world. So yeah, I got schooled, but I guess she was right.
When she left, I was a believer of the paranormal, and glad to be rid of all the entities in our apartment and the one attached to me. We had no more incidents in that place afterwards.