First I would like to say welcome to PC. I am unfamiliar with MDD also! I am sorry. But there is so much information offereed in this site I am sure you will find what you need.
I do not totally understand what happen with your 911 call. But I am sorry, I have rarely seen our men in blue helpful in any at home situations. They are most successful at putting the victims on the defense! It is sad and sounds like the police did not handle this call well! Good luck to you