Hi and welcome to HCM.
It is hard to say the diagnosis considering what you ve said but first thing is to make clear is this caused by abdominal organs or abdominal wall. It can be hernia
or subcutaneous lesion in abdominal wall,in this case it can be easily surgically managed. But knwoing taht you had surgery already there can be intraabdominal pathology usually casued by adhesions. Or this can be new disorder such as gastritis
stone. To evaluate all this you should do at least ultrasound
and the pal further tests and treatment. WIsh you good health.