Difficult to evaluation over the internet, and it is unlikely that I can come up with something that your consultants, the Brigham and the Mayo haven't already thought of.
I am sure that anatomical tests like a cystoscopy has been done to evaluate the anatomy of the lower GU tract. Prophylactic antibiotics can also be considered to prevent further infection.
Another opinion can be sought at another major academic medical center.
I am not aware of Sphincter of Oddi dysfunction being connected with recurrent urinary infections.
These options can be discussed with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
kevinmd_