My experience has been that just as fast as the walls come down, the mind builds them back up.
"My hardcore materialist atheism was beginning to be challenged. But my identity was so solidly based on my materialist atheism that I soon attributed the entire experience to merely a "drug trip" with no meaning for my life!
Perhaps the greatest lesson here is that. No matter what you experience, your identity can write it off as unreal if it conflicts with who you think you are."
http://tafkajestdr.blogspot.com/2013/01/intro-to-tafka-jestd...
I recommend meditation.