Every time I bend over from the waist I feel as my internal organs are moving around. Sometimes it is painful. Sometimes

Given your history of abdominal surgeries, my initial consideration is that you may be dealing with an incisional hernia, which is a defect in the peritoneum or abdominal wall. Without the ability to conduct an examination, it's challenging to provide a definitive answer. I recommend a comprehensive evaluation by your primary doctor. If a hernia is indeed developing, it could worsen and lead to more serious complications. I hope this information is helpful.

A general surgeon is the most suitable physician to consult. They can perform any necessary diagnostic studies and also carry out the repair. If the condition becomes too large, it may disrupt bowel habits and could potentially lead to strangulation, resulting in possible peritonitis.

The UGI likely indicated a hiatal hernia. A hiatal hernia is typically treated with H2 blockers such as Prilosec or Nexium. If the condition is severe, surgery may be necessary, but I would recommend trying medication first. It can also be associated with H. pylori, a type of bacteria. Testing and treatment are available if you test positive for H. pylori.
However, there is another issue that can arise from multiple surgeries, known as adhesions. Adhesions can cause scarring in the abdomen, which may slow down or partially block the movement of stomach contents to the colon, often resulting in pain. They can lead to additional complications. An incision hernia may also develop from surgery, where a weak area of the omentum allows a loop of bowel to protrude from the abdomen. This is probably not what you are experiencing, but it requires treatment to prevent the risk of developing an area of dead bowel, which would necessitate emergency surgery.
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The previous expert provided a partial answer to your question. Specifically, a hiatal hernia happens when the opening for the esophagus (the food tube) becomes excessively wide. This condition permits some food content or a portion of the stomach to move upward, leading to your symptoms. The burning sensation is caused by acid that aids in food digestion, which then ascends to more sensitive areas.

I hope the medications will resolve the issue. According to the radiologist's assessment, it appears that medication will be effective. Wishing you the best, and thank you.