Eileen, I certainly don't have medical advice, but as far as the carotid goes, I think that the primary danger of stenting those is the chance of having plaque break loose. It sounds like you don't have a plaque problem, but stenosis due to radiation, so the procedure should be much safer in that case.
Nonetheless, I can imagine your anxiety. At least, as you said, it's NOT cancer! How nice, for a change!
Keep us posted.
XO--Colleen