Hi Freedance,
Said before but it's worth saying again, you must take care of yourself and your addictions, as only you can. Your daughter and the other influences cannot help you, nor can you help them. If possible get out of that environment for a while and focus on yourself.
We all have our demons. Stress triggers mine - or so I say. I did realize however that I can be no help to anyone if I cannot help myself first. It's hard and as a mother it seems selfish. But it is not. You first - keep thinking that and good luck.