Hi and welcome to Healthcaremagic. I understand your concerns and I will try to help you as much as I can. Well, lower colon and rectum are stimulater by sympathic and parasymapatic nervese which are made of nerve roots from Th12 till S1 vertebra. Your pain and constipation may be caused by lumbar stenosis but this is not likely. Generally, certain degree of bloating is normal but in case of excessive bloating it may be sign of food allergy, hiatal hernia ,IBS or inflammatory bowel diseases. So you should do gastroenterologic work up but first try to change your dietary habits, it means: eat smaller meals but more frequently, avoid fried and spicy food, take menta tea, avoid alcohol and coffee, eat probiotics and milk products, boiled food and vegetables. Also, there are medications such as Flobian,Magnesium oxide or certain Laxatives which may relieve such symptoms of this continue. If there wont be improvement on these measures, you should consider doing diagnostic tests such as colonoscopy, anal sphincter manometry and food allergy testing. I hope I have answered you query. If you have any further questions you can contact us in every time.