Hi I Have An Issue That No One Can Seem

Hi I have an issue that no one can seem to help with...I recently had surgery for a hernia in my abdomen in May and I have been pain on my left side that has been steadily getting worse and I have nausea when I eat and it gets worse after eating. also have a lot of swelling in my feet all of a sudden and rapid weight gain. My doctor thinks it is indigestion and said just take for Prilosec that she prescribed for me 40 mg.