Shepard Barry
Oh if there's one person I'd absolutely trust with your secret, it's Sara. I won't say anything of course, but to put my vote out there, she'd keep it. I can understand your hesitancy but, if there's anyone who I know of that could help, she'd get that vote too. Plus she's the type who just would want to, one of the many reasons she an I get along so well. Just some food for thought, no pun intended.
And, a little tip? Always flirt with your Doctors. That's a rapport you don't want to be just clinical. Maybe not the best advice in your position, especially if she knows Iris, but keeping things warm and friendly? It tends to encourage a little delicacy with the needles. I say this from experience, because I've known a lot of doctors in my time and most of them are just a little too needle happy for my taste.