Hi
I've had ALL of the above mentioned done. Nothing was ever found apart from h-pylori bug which I was treated for. My symptoms continued and still do. Yip, the stuff I had to drink certainly cleaned me out too. Many parasites canhide in the intestinal wall so a lot of these investigations find nothing even though an infection IS present.
Had the sinuses done too, nothing found. (Although samples were never taken). Very doubtful ultrasound will show anything. I may be wrong.