Other realm

What is "other realm" here?

I reached the point where I was given the choice as to whether to return or not, at first I didn't want to come back, I didn't want to return because it was so beautiful on that side my body was dying and I had been suffering my family had been suffering because I was dying so no part of me wanted to come back. but my dad who I met in the other realm, he was encouraging me to go back