@ruben - I don't know if a scan would help you, but wanted to tell you what helped me. Several years ago I would get full very quickly, food felt like it was just sitting in my stomach, digestion was way off, and it was muscle testing done by a competent chiropractor which revealed that my gallbladder was not up to par. The chiro gave me a product by Standard Process, AF betafood, which worked like a miracle. It took a few weeks. I also learned I was low in stomach acid (which seems to be very common in ME/CFS) and that was part of the problem. And then my liver was overloaded with toxins and I had to do a liver detox, but after sorting through all of that, my digestion was so much better, and it's continued to be better for many years. I still have to take betaine HCL with pepsin with meals and also have added in pancreatin.
I'm not saying you have the same issues I did, but just suggesting you give muscle testing (also known as applied kinesiology) a try. It helped me so much with my digestive issues. This was about 20 years ago and I still use MT for various things.
I think I had pretty much given up on regular doctors to help me by the time I found the chiropractor. I still see them for standard blood work but if I have a mystery symptom, I don't bother.