I had the same symptoms and lost 31 pounds in two months. I agree with grannydee about checking for EPI. I recently had a "fecal elastase" test which showed I have severe pancreatic insufficiency. I was diagnosed with EPI and will be starting pancreatic enzyme therapy soon. I also had many tests, endoscopy, CT scan and colonoscopy. Thankfully, all the common GI diseases were ruled out. It's difficult to check your pancreas without doing additional invasive tests.

Hope all turns out well with your ultrasound. All the best in getting a correct diagnosis.