I made an entire game for a game jam you hosted, so I'm hoping you get this. It sounds a lot like the voices you are hearing might be linked to schizophrenia, but from looking at what I've heard, I'm going to be totally honest with you and say I believe you were being tormented by the ones below everything.
I know, I know. It sounds far fetched, but sometimes me and other family members have felt their presence and at one point a priest came and anointed our house and us. It's been a lot better, but it is still slightly terrifying to encounter them.
Though I've never experienced something so traumatizing, It's hard to get past some dark moments in life without help. I can't guarantee I can help you, or that anyone else here can, but I can guarantee it will turn out for the better. After all, we have all been on this planet for a reason, even him.