Welcome to HCM
You have a Umblical Hernia initially they are reducible and correctable by surgery and for this you must see a general Surgeon
,If good muscle strength is there this can be repaired or if required a mesh may be used.
One should avoid constipation
by taking good amount of water and fibre soluble and insoluble fibre in diet.
If acidity problem along with reflux acid suppressing drugs and prokinetic drugs like Omeperazole and domperidone
may be of great help in consultation of your gastroenterologist.