Thanks for your reply.
Basically reviewing your history I would not attribute low back pain 'shooting down the legs', to IBS. Severe IBS can cause low back pain, but even then, the appropriate workup for low back pain including imaging studies are required before attributing the back pain to be due to IBS. Also rectal and anal pain is rarely caused by IBS, and needs a physical examination by your doctor to diagnose the common causes for rectal pain.
IBS is basically a diagnosis of exclusion. All the other conditions that can cause your symptoms have to excluded through relevant investigations (such as complete blood count, sigmoidoscopic examination, and stool specimen examination), before diagnosing that your symptoms are due to IBS.
Alternate diarrhea and constipation may be seen in IBS. Anxiety disorders are also common in patients having Irritable Bowel Syndrome (IBS), which can cause recurrent abdominal pain.
Increased stress usually causes symptoms of IBS, hence relaxation and hypnotherapy is also used to treat IBS. In fact this is a vicious cycle, with stress causing increased symptoms, and the increased symptoms will in turn cause increased stress and anxiety. Therefore another therapy known as Cognitive behavioural therapy is also beneficial in this condition.
Presently, I would advise you to consult with your doctor about dicyclomine [Bentyl] for the pain and Loperamide (Imodium) for the diarrhea. Supplementation of fiber is also beneficial especially for constipation.
Also you can try out using probiotics, containing Bifidobacterium infantis, like Activia Yogurt.
You need to relax and not be stressed, as the prognosis of IBS is good, with majority of the patients learning to adapt to their symptoms and leading productive lives. In fact, if it is diagnosed as IBS, you should be happy as it is a benign condition and there is no serious underlying disease.
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