RSD/CRPS is a neurological disorder, but a component of that is that it does cause depression. In fact, depression is a symptom used to diagnose it.

Stress can absolutely exacerbate pain symptoms and learning not to guard effected limbs should be a top priority. Learning to breath deeply or meditate when you begin to experience a flare, can be a great help. Even listening to soothing music can make a difference.

On top of the stress caused by severe pain, there are a whole host of difficulties that often accompany this illness. Isolation, permanent disability, financial instability, insomnia, etc. So for anyone with a legitimate case of CRPS, I'll say don't let any doc try and convince you that CRPS is a psych issue. It's a medical issue that effects brain chemistry. And yet, a pain psych doc might be a huge benefit at various points along one's journey dealing with this disease!