Hi joy -
Back pain can be referred pain from the stomach, sometimes heart (but don't worry about
that just yet because the stomach is right next to the heart). Do ask your doc about
I just ate after surgery, still do 2 years later, a very small portion at least 4 times a day, sometimes 5 or 6. Your stomach isn't nearly as large as it used to be. It's great if you need to lose weight. My burping still isn't as good as it was, so I just take more care what I eat and how I eat it. I follow all the recommendations to avoid gas, chewing food well, not drinking sodas, not using straws.
Some people have too tight a wrap and food gets stuck. I wouldn't ask for a stretch just yet! You might get worse reflux back. Just keep the food soft or very well chewed.