I'm no expert here, I joined the board because my wife is diabetic, so foreskin doesn't apply. But a few years ago I had a work colleague who had to be circumcised at age 46 because of his diabetes. I don't know what specific problem he had, and I know he was dreading having it done, but I do know he felt a lot better for having it done. It must be worth looking into.
Good luck
Duncan