I am so sorry and can so relate to every emotion you feel.
The same thing happened to my daughter with poor medical/medication care, wrong dose, and given SSRI she had documented seisures from.
She died in our home during her sleep, I had given her the meds, did not know the new ones were SSRI many of them, and the full dose of Duregesic patch when she had not had any for a week.She also was 29.
I am consumed with gried and guilt.

There are no answeres, no way to lessen the heart aching, and missing of someone that was a huge piece of your life. Takeing care of my daughter and advocating her care was a full time job. Tough with her being bipolar, disabled with nerve damage also, and in crisis at the time she passes....Lack of health system caring, and treat them and street them attitude.
I have three complaints from her stay there, and now I blame them for her death,

One day after she came home with the ten meds I felt so confused about but they reassured me!
I cry with with, I send you hugs, and my love.
I am so deeply sorry someone else is lost from the lousy system and makes me all the more determined to go after those involved in her treatment.
Dianne