I would mention it to your pain doctor. It probably is related, but you never know. I know that IBS is a symptom of Fibro. Your doc will at least be able to give you something to help manage the problem.
I have never had the trouble you have had, but did have IBS for years before I was diagnosed with Fibro. Now, I am constipated all the time from my meds, but Metamucil has helped that.
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Fibromyalgia*Osteoarthritis Of Spine*Sleep Apnea*RLS * Depression*Chronic Fatigue*Allergy/Sinus*Menopause