I hope you are feeling better.
According to your history this is probably a paraumblical hernia
. The lump that appears is abdominal contents coming through an opening in between your abdominal muscles.
The best remedy for you will be an examination by general surgeon
and if hernia is confirmed an operation will be done.
in the mean time just do not put pressure on your abdomen too much and when your sneeze,cough
put a hand on your abdomen where the lump comes out.avoid picking heavy objects.
and relax your body
Good luck and get well soon