J's fingers do weird things too. VS says it because very little blood flow due to placement of fistula. Is your fistula around the wrist of your arm? J's runs from wrist to almost elbow. It was explained to us that some veins were cut and attached to form the fistula. It is just something he gets use to, but if it get to much to bear, then let doc know.
God Bless,
lmunchkin