I have been having a strange experience lately with hearing a strange voice, often when I'm in a state of sleep paralysis.

It says awful threteating things to me in a voice that sounds like it comes from a voice modifier. What scares me about it is that it refers to things the voices that I hear in my head talk about.

It is a very distressing experience but I am prepared to recognise it as just a hallucination, after all it usually happens when I'm in a state of sleep paralysis and even people without mental illnesses experience things like this sometimes.

But there is some part of my brain that questions the voice and wonders if someone is stalking me with he intent to kill me. After all that is what my delusions are about. 

Please help, it scares me.