I'm so sorry to hear this, Rita!
I am glad that you survived, and I wish you a complete recovery!
Please keep Dr. Druey completely informed of what happened, and ask him the same question. It's important for him to learn exactly what happened in which order back in December, and what the hospital did about it.
The best thing for you to do -- for your future safety as well as ours -- is for you to request that a copy of your December, initial hospitalization records be sent to him ASAP. As part of that, hospitals prepare a "Discharge Report" which explains what transpired between the time of admission and the time of discharge. Get one of those also for yourself now that you have gained some perspective.
Please also update your profile page with whatever details you can share with us.