This from Annette Nibley;
"What now? Can I tell you how to find out that you are not real? At this moment, nothing like that is arising, but perhaps it will. I don't think it's possible to tell another person how to begin or conduct this inquiry. Yours is unique, it is intimate. It is your business. What you need will come to you when you need it.
If I offer a pointer, it assumes that you are "ready" to hear it like I was when I met John Wheeler. Otherwise, you'll just continue the way you are going, and you'll distort my words into something that fits your existing mental view. But just in case you really are done with looking to your mind for solutions, this would be a solid pointer:
Ask, Am I real? Look for no other information. Ask no other questions. Find out if you are real - that's all. If you are not real, then the boundary between you and the source of all life is not really there, is it? If the boundary between you and the source of all life is not really there, then you would notice yourself as the source of all life, wouldn't you?"