Feel constant 'gurgling' in right side under rib cage and pressure there - ct w/ contrast and ultrasound showed nothing?

Bowel sounds: Likely represents fluid and air and/or solid material going through the intestinal tract, and is not dangerous. The intestinal tract is very complicated, and can be quite different among individuals in terms of reaction to various foods and environmental exposure. AT age 58, you should have already had a screening colonoscopy, and if this is fine, along with a normal ct and ultrasound, you're ok.