hi, thanks for providing the brief history of you. since you mentioned you are overweight and you has hiatal hernia, you also underwent surgery for it. your weight was 210 and now it is 250. I will initially recommend you to do one abdominal scan on a safer note. Meeting a specialist will not harm you. If you have to pay little you can get it done rather getting pay later with huge amount while admitting. also to mention, you need to do core strengthening exercises and overall body as well. your muscles should be tonned to avoid any protrusion or empty space in the abdomen. also your weight should come under control this will happen if you do regular exercises. if you start slowly and steadily it will help you. meet up a physical therapist and tell him the complain you have with protrusion and pain in abdominal region post and pre surgery. he will surely help you and teach some exercises which you can perform on your own later. doing the correct exercises will help you make core stronger and any thing after the abdominal surgery you needed to do exercises to tone the muscle. it starts with breathing exercises initially and later onto the progressive exercises. if you follow the routine exercise regimen you will get good tonned muscles and any injury coming will be avoid or subsided. With the grace of God I wish you a good health. you can contact me if you have any doubts to tone the muscle and the kind of exercises you need to perform regards Jay Indravadan Patel