I have had this up back pain accompained by right flank gnawing/burning type pain for one year. All CT and MRI and ultrasound ok. I am ANA + 1:640.?

Not ANA related! This positive test is only confusing you. There are more causes for soft tissue back pain that cannot be seen by imaging! clearly, an ANA associated disease would not cause your problems. I would see a pmr doc, or a rheumatologist, although many are not as familiar with soft tissue back issues, as a physiatrist!