"As I live and breathe" is an idiomatic expression used to express surprise or shock. It has a few synonyms that can be used in its place based on the context of the situation. Some possible alternatives for "as I live and breathe" are "by golly," "by crikey," "good grief," "Holy smokes," "My goodness," and "unbelievable." These phrases can be used in different circumstances, and they all convey a sense of surprise or disbelief. By using these synonyms in the right way, it is possible to express your surprise, incredulity or awe without having to use the same phrase every time.