According to the texts, Vipallāsa means seeing false as true, hell as heaven, evil as good.
Vipallāsa is the state of mind when one discovers something excellent and thinks that he can keep it. So he leaves self-awareness behind to get that thing. It is like it was stolen by a thief. When he starts looking for it, it is no longer there. It is hidden.
One should not leave self-awareness even at the End of Suffering or whatsoever.
I realized the End of Suffering after I attained it. At that moment, I was in the state of Vipallāsa. I clung to ecstasy because I had never been like this before.
I was walking back and forth and I felt like I was floating above the ground about 1-2 meters. Actually, I was walking on the ground. I clung to that ecstasy but it did not last for long. Then I was aware of myself, “Eh! Why is it so?”
I began to review the Objects of Insight. At this stage, you should review the Objects backwards and forwards, but this does not include Roop- Nahm Objects.
After reviewing the Objects, the ecstasy will gradually fade away. The mind will return to the ordinary state.