What do you call a hallucinating problem?

Answer 1

It depends on the underlying cause of the hallucinations.

Hallucinations are by themselves simply a symptom; specifically a "psychotic symptom." The question you're asking, unfortunately, pre-supposes that all psychotic symptoms derive from the same root cause.

Hallucinations, like any psychotic feature, might be brought on by organic processes within the brain (ie dementia), neuro-psychiatric processes (ie Schizophrenia), drug intoxication, poisoning, fever, etc. You need a skilled clinician to analyze the accompanying symptoms to tell which category the "problem" falls under and what the specific illness or condition is.