You have to pass through a dark night of the soul.
Everyone does, including you. A time comes when what you have always believed is true melts away underneath you. When you cast in doubt even the most obvious, the most simple. When it seems that dark night is all around, and you are all alone. Take heart, this journey through abyss is the final barrier before your emergence into the heavenly light of a new synthesis of your being. God is waiting for you on the other side.