If it happened just once, I wouldn't be much bothered. Sometimes our brains play strangest tricks on us, especially when something strong needs to be processed. I have some expiriences that I would call mystical in my life record. Wheather they were really contacts with the Other World or just my brain processing really hard stuff at that time, I don't know. They didn't progress or come back.
With just one occurence, I wouldn't hurry to a psychiatrist. Being misdiagnosed with schizophrenia is a horrible crap and it's extremely hard to get out of it. Been there, got a t-shirt. If your life returns to normal without any intervention, antipsychotics may only make things worse.
However, if hallucinations reocur, amplify, cause extreme anxiety or something like that, go to a psych.
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Let's not confuse being normal with being mentally healthy.
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