Was it just recently that you were diagnosed with RA? You have a few things that are in your favor! I mean, it's terrible to have to live with CD and RA (I've the same), but at least you have a positive lab for RA, hallmark symmetrical joint pain, and you do respond to NSAIDs...those will all help you & the Drs in treating the RA.
Even though the RA factor is positive, developing fibromyalgia is still possible and you can be getting painful muscles and tissues from the CD, the RA and any inflammatory processes that are going on in your system. They ach like you have the flu. And, when one disease flares up, it can trigger the other disease to flare as well. Also, the CD or RA could have caused the fibro symptoms.
Many systemic factors attribute to fibromyalgia. The diagnosis is made by signs and symptoms and also by certain "sensitive/tender" spots on your body which the doc palpates signaling the fibro diagnosis. It is thought that fibro is a symptom of some underlying disease...which is why we folks who have autoimmune disorders are many times diagnosed and treated for fibro.
When seeing your rheumatologist, make sure he knows that not only do you have bilateral joint pain, but your muscles hurt as well.
So what are you using for treatment for the RA?
I've been trying to get control of my joint pain since 2001. Just diagnosed with CD in august. NSAIDs do a number on my guts...so I can't use them at all. (Had RA since 16, but was not treated until I was 22) Taking Humira now...but I really want to recieve Remicade therapy since I'm not responding too great to the DMARDs and the remicade is also used to treat CD, so why not have the best thing out there!
Looking forward to hearing from you. Take good care.