One thing. During a few years prior to the "wild" experiences there were periodic knockings from my wall. In hindsight I think these were related. I was absolutely sure it was physical and I even had the building architect around to see if he could figure out if there was a problem with the building.
Other people heard these knockings and we never found an explanation. Sometimes it would knock 24/7 and it was almost impossible to sleep.
Other from that: even if we put a camera inside my apartment I am not sure anything other than the chair could have been picked up. There was an "invisible being". I was being touched and passed through by. I regularily walked in a nearby forest and sometimes I had experiences there as well. In other words the phenomena was following me. It was not restricted to my house (like a typical "ghost" would).
I have been pretty far out mentally due to my traumas so I really had to notice these phenomena if they could be hallucinations or something paranormal before I decided whether to contact a psychiatrist or a psychic person. I decided the latter and she learnt me to work with my inner traumas and repressed memories and gradually the phenomena disappeared. I think my sightings and auditory experiences might be able to be explained as a sort of hallucination but the invisible being I stumbled into. I can't see why my body should have that function built-in to create that illusion (since I am not the only person with these experiences).
Here is a psychic with her explanation of it, which fits very well with my experience and what the psychic person I visited told me to do:
https://www.crystalannecompton.com/poltergeists-what-they-are-and-how-to-clear-them/