If there is a doubt that you are hallucinating, it is better that the benefit of doubt is given to hallucination than to your experience, because if there is a genuine experience, some transformation will happen by itself. If it is hallucination it is anyway a waste of time. So if you are in doubt, it is better to simply see that you are hallucinating because once you start crediting hallucination as real, then you will have no control over it. It will just go wild.