Visions of Hell Realm in Contemplation- What does it mean
Some relevant advice here (from Awareness Itself -- Visions &amp; Signs) by Ajaan Fuang:


  § "Don't have anything to do with the past or the future. Just stay
  with the present — that's enough. And even though that's where you're
  supposed to stay, you're not supposed to latch onto it. So why do
  think you should latch on to things where you're not even supposed to
  stay?"
  
  § "You know that you shouldn't believe even your own visions, so why
  go believing the visions of others?"
  
  § "If you can't let go of your visions, you'll never gain release."
  
  § One of Ajaan Fuang's students asked him, "When you see something in
  a vision, how can you know whether it's true or false?"
  
  His answer: "Even when it's true, it's true only in terms of
  convention. You have to get your mind beyond both true and false."
  
  § "The purpose of the practice is to make the heart pure. All these
  other things are just games and entertainment."