Hi. Thanks for your query and an elucidate history. The most probable cause of the pain on coughing in the belly button area is either a sprain in the muscles in this area, or tear or a hernia. This is best diagnosed by an examination done by a General Surgeon. Ultrasonography may or may not help unless the Radiologist knows what to see. Once a proper diagnosis has been made the treatment will be according to the exact problem. If sprain or so, muscle relaxant, anti-inflammatory medicines, complete bed-rest and of course the most important is the control of the cough.Take products with codeine which needs a prescription as this will control cough as well as the pain. Take laxatives to avoid strain at passing bowel movement. Hormonal changes at menopause have indirect effect as the psychological overlay causes more pains, stress, anxiety adding to the already existing problems. The lovely old lady syndrome.