Yeah, its an older cat. I'm inclined to think it got bored and into something bad like plastic, who knows. The ultrasound sounds like a good idea as long as someone experienced and professional is able to observe the results.
I liked the breed of cat known as the Maine Coon cat, which has a story on Medium.com here. This breed is similar to having a dog pet than a standard cat pet, after reading this I figured out one of our strays we picked up decades ago was probably a Maine Coon variety. Zulie Rane has some more cat stories though she also is in the overpopulated Medium trope of productivity online, and other endless what to dos with a side hustle/gig, etc.
However, there are more cat and animal stories of possible interest on the Medium pub https://tenderly.medium.com/