This one is tough. First, if you are experiencing hallucinations or delusions, please seek professional psychiatric care.
As a psychic medium who also is a health researcher and a BA in psychology, I have experienced dreams, waking life, and clairvoyance.
Sometimes it is tough to differentiate between dreams and waking life because I dream very lucidly but there are usually tells. And clairvoyance is more of a mind’s eye vision. So the vision actually looks like how you would visualize something in your mind. Hallucinations are very different and something to seek help for.