Yes, would think that with all of the tests and appointments you have done and gone to, that it would have been found.
So, that leads you to one of two conclusions...
...either your doctor is missing something, and you need to seek a specialist
...or your anxiety is causing somatization, and your symptoms are not indicative of anthing more than the anxiety issue.
In either case, you are going to need to take a pro-active route.
You will need to find and pursue a specialist for a full evalutation(s) until you receive your diagnoses, or you will need to get into treatment for the health related anxiety.
Either way...this requires your motivation and effort, or you are just going to keep spinning your wheels.
I do not mean to sound harsh...but I do want to see you get better in one sense or the other, because we can't help you beyond the basic support here, and the next step must be yours.:)
You can do this,
S.C.