Dunno really, I used to get sleep paralysis but without visions or hallucinations, it was just the part where your brain becomes conscious before your body wakes up so you get the "oh shit I can't breath or move...fuuuuuuuuck...."
I can't say I've had hallucinations with sleep paralysis but I've had very vivid recurring dreams that although out of the ordinary to say the least had nothing about them that you could wake up and prove to yourself that it was definitely a dream, initially after waking up I'd have no idea if I was awake or dreaming or at what point I had woken up and it went on long enough for me to wonder if it was actually happening. But still that doesn't com pare to waking up thinking you are dying. Hearing things or seeing things I just about deal with, but thinking that you've stopped breathing for some reason and can't do anything to make yourself start again or even move or speak to try and get help, that takes it for me.