Hi. Thanks for your query. Pain at the belly button is not a normal occurrence and whatever the instigating factor this has to be investigated. Lifting the heavy weight might have pushed the fat pad into the preexisting umbilical hernia. Another possibility is pre-existing granuloma and not getting inflamed and causing pain. The pain is getting increase with urination, coughing and sneezing as these cations increase intra-abdominal pressure. I would advise you the following: Physical examination by a General Surgeon. Any investigations like ultarsonography may be of help, but it us the clinical examination by an expert that clinches the diagnosis and certainly you may need a surgery; be prepared for it if it is needed.