I would go to a doc if I was hallucinating. It'snot normal and could happen due to several reasons- mental illnesses being only one (and minor) area.
And I HATE docs.

Re the BF comment- well, he could have put it better but yes, I could see myself not trusting a word of s.o. hallucinating-depends on the context- if you were telling me about stg you saw/heard I might have my doubts...