Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. First of all, I thank you for your trust on us. Let me reveal that you have got all the risk factors of an abdominal aortic aneurysm like being male,hypertension,history of smoking.your back pain can undoubtedly attributed to aortic aneurysm.usually, when the size of the aneurysm is 5-5.5cm, surgery is recommended. Even when the size is rapidly growing, surgical intervention is advised. Anyhow, you are going to meet a vascular specialist and would be guided further. Regarding bladder function,loss of bladder control is a complication that too very rare after an endovascular surgery for abdominal aneurysm. Frequent bladder and bowel movements can occur normally without any pathology in many people. So just relax. Now your main concern must be in preventing the rupture of the aneurysm. The following are some of the measures to be taken to prevent rupture : a) Strict control of hypertension b) Cessation of smoking c) Avoidance of any increase in intra abdominal pressure like chronic constipation,coughing etc. Hope I have answered your query. Let me know if I can assist you further.