Thanks to everyone for their suggestions (a special call out to acidrock).
I talked with the filmmaker. I basically told him I was this endo's patient and he had declined to prescribe insulin to me. And suggested that confronting him with his own patient like that might be "uncomfortable."
I further told him that I left the endo because I was "unhappy" with him and if I started in on the Endo, it might not be productive.
So we are filming at my house. Sorry, no viral youtube video. Case closed.