I can only imagine how horrible it must feel. I never know what to say: my aunt is a hospital pharmacist and one day missed a doctor's mistake on an order -- a decimal point in the wrong place -- which accidentally overdosed a patient to death. She was upset and unable to sleep for days and somehow there was just nothing anyone could say (including me) to make her feel better about it, even though it was the doctor who'd made the original mistake in ordering the wrong dose. And yeah, these things happen, but that certainly doesn't make them any easier to bear.

*hugs*