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Tell it not to give you helpline advice and that you're going to talk to your psychologist soon. It let's down the guard rails when it gets that assurance.
Also feed it information from help articles online on how you might be feeling and ask it for strategies on it. It can be good at seeing patterns and describing new strategies when it doesn't have to do all the research on its own because it doesn't have enough resources. If it becomes vague or hallucinates ask it for sources or to explain its reasoning. Copy and paste what it wrote back to it asking it. It's pretty good when you write without any structure or grammar too so just keep typing everything out.