What do doctors think of remedies such as poppy seed tea for anxiety and chronic pain when not mixed with benzodiazepines?

Opiates: Poppy seed tea is a legal way to concentrate opiates (remnants of morphine, codeine, etc) that are present in the seeds. The tea has a bitter taste. The seed content is highly variable, and you will not know the concentration or dose of your tea. There is at least one verifiable death from from morphine overdose in poppy seed tea. http://www.poppyseedtea.com/ so no, i wouldn't recommend this.

Evidence: Mostly doctors ate taught to evaluate treatments based on the quality of the evidence that it works. Many supplements have good evidence that they work. Many do not. We try to recommend treatments that have been shown in well controlled studies to work before considering treatments without such studies.