Knowing something must be checked, while your primary refuses to check it, what is one's recourse in the US?
https://www.discountedlabs.com/choose-a-test
Or use your insurance's telemedicine portal to get a random doctor on the line and get them to order the tests.
For many people this will be out of reach but for those earning a comfortable salary, you can pay out of pocket for X-ray, CT, MRI, etc and they're "only" like $500-2,000.