But I'm not asking if you know they can happen, I'm asking if say when one happens that you know during the vision that it's exactly that. Are they always announced by the "demons" in your head?

I wouldn't give credit to the demon world without just proof...and visions aren't just proof. Like I said, spirits can lie. Frankly, I believe anything dream or vision related that you think is spiritual or celestial in nature should be weighed heavily first and all other possibilities should be ruled out. I see you have Psychotic Disorder NOS listed on your About Me. I'd be willing to bet that these visions and demons wanting you to die are part of the disorder.