I agree that you should see a Gastroenterologist for consideration of colonoscopy, as it's now been about 5 years since your last scope. If this exam rules-out any pathology in your colon or rectum, then other causes for your symptoms should be sought. Generally speaking, adhesions from prior pelvic surgery do not cause the type of pain that you describe when you push on your back (that sounds more like myofascial back pain, to me). However, it is impossible to render a specific diagnosis over the Internet, and so I think that starting with a visit to a GI doctor would be a good place to begin.
Unfortunately, there are many conditions (both benign and malignant) that can cause chronic pelvic pain in women. If the GI doctor cannot find an explanation for you, then your primary doctor might consider referring you to a gynecologist to assess for possible pelvic adhesions secondary to your prior surgery, or other gynecological causes of chronic pelvic pain.
Sincerely,
Robert A. Wascher, MD, FACS
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