Is it dyslexia to unknowingly zone out briefly sometimes leave out letters when spelling not spell very good mainly a visual learner and when nervous sometimes says preformed sentences kinda backwards?

The symptoms you describe, such as zoning out, leaving out letters when spelling, and reversing sentences when nervous, could be associated with a learning difference, but they do not definitively indicate dyslexia. Dyslexia primarily involves difficulties with accurate and fluent Word recognition and by spelling and decoding abilities. It's important to consult a professional, such as a psychologist or educational specialist, for a comprehensive evaluation to determine if dyslexia or another learning issue may be present.