My belly button detached after abdominoplasty 15 years ago. Is this a problem?

15 years ago I had an abdominoplasty. right afterwards i had bronchitis and literally 'coughed' my belly button scar free from the stalk (?) . Is this a problem as i occasionally have pain there and my belly is convex instead of pulled in at that point? I miss my belly button as i have just a scar there that doesn't pull in at all - and what happened to the inside part of my belly button? It was cute before surgery...and it looked good after surgery...until it separated from my insides.