I am so sorry you have had to come here.  Your daughter is beautiful and your loss is so new.  My heart knows what you are feeling as do most of us on here.  I hope you will have support from family and friends and also here.  It's a rough journey.  Allow yourself to grieve and get through each day as it comes.  
I also lost my son to a prescription medication, but he had other problems as well.  He had just turned 41.  I am going on 4 years and it has gotten to where I have kinder and gentler days but it takes time.
I pray you are given strength and compassion as you work through this.