Gastroscope question

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Has anyone had normal gastroscope but still has gastroparesis? I have all the symptoms for gastroparesis and suffer constantly. Had gastroscope under general anaesthetic and they said all looked normal and I wondered if it would under a general if it was gastroparesis as could they see the valves working properly(as that was suspected issue?)? I've had slow transit study that said definite slow transit. I'm wondering if there's other tests that could diagnose it?? Thanks in advance