This is how I do it:
I use a live visual instead of trying to see one that isn’t there. or least that’s how I learned to do it, now I do it this way if I want or just use something because it looks cool if I want.
I have no idea.
I assume so but I don’t know anyone that can do it so I can’t tell you what is right to believe in or how to achieve it.
I’m sorry I really don’t see how I am qualified to help you with any of this, if any of it is truly occurring I am sure it’s a horrible experience, but short of ignoring it and learning to work with your other senses, I don’t have any idea how to best handle it or begin to.