I began to question reality after doing mushrooms. It was the single most traumatizing/liberating moment of my life. I had since began to dabble in Buddhism, which I feel is a great spiritual path/paradigm to build your life around. I think you will feel more comfortable with LD'ing once you accept some form of reality as truth. I know it's hard to do when you see the other side so to speak. I also have heard that the book No Boundaries is very good, you may want to take a look at it.