Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Use emergency services or a crisis service now if you or someone else may be in immediate danger.
This includes having suicidal thoughts with intent or a plan, being unable to keep yourself safe, becoming severely disconnected from reality, or hearing voices telling you to harm yourself or another person.
If possible, stay with a trusted person while help is arranged.
Seek prompt medical help if you develop new hallucinations, rapidly increasing paranoia, severe confusion, several nights of very little sleep with major behavioural change, or a sudden decline in your ability to manage daily needs.
Arrange a routine appointment with a primary care or mental health professional if unusual beliefs, suspiciousness, social fear, or isolation are causing ongoing distress or interfering with work, education, housing, or relationships.
Assessment can also check for other conditions with similar symptoms.
Every sign above is quoted from the sofidex article on Schizotypal personality disorder. If you are not sure, err upward — it is always reasonable to be checked.