After my JRA kid has normal labs, mri and exam....they now say he has Converting Disorder.
Conversion Disorder is a dubious diagnosis. It's rare and extremely difficult to diagnose, it takes years to get to a dx of conversion disorder and multiple doctors are required (rheumy, neurologist, psychiatrist, physiatrist). I'd suggest you get a second opinion - http://www.nlm.nih.gov/MEDLINEPLUS/ency/article/000954.htm
I've had JRA for 39 years, there have been times I've had little obvious inflammation, good blood tests, etc, and still been in pain. Every rheumatologist I've every seen has said this is common in JRA.
I'm glad someone else answered who has some of knowledge of this. It seems like you could do what they are suggesting - see the psychologist - and also get other opinions at the same time. Trust your instincts. I am in the same position. I was dx with JRA over 12 years ago and my blood work has been normal for at least the past 8 years. I would def get a second opinion, so many rheumys have told me its in my head....It's weird, my rheumies (in Conn & Florida) all have said blood work doesn't really mean anything - it's only suggestive. My current rheumy has told me flat out you can have normal SED rate, negative RF, etc etc and be flaring at the same time.