I know this thread is old but I thought I would check and see how you are going. I know what you are going through.

My DD15 was dianosed with depression earlier this year. One day I accidently walked in on her after a shower and saw that she had been cutting her self so I started therapy with her straight away. I had so many people tell me tha she was doing it for attention but I knew otherwise. When she was diagnosed I felt like rubbing it in their faces (school was the worst of the lot)

For a while therapy help right up intil her absolute bestfriend took her own life and she was the pall bearer at the funeral (it is not fun to watch your DD carry her bestfriends coffin) and her cutting started again and she lost all interest in school work she couldn't concentrate and was struggling day to day.

Eventually she waqs placed on medication and since it has been in her system for a while now we haven't looked back. I went through so much guilt for my teenager needing meds but when it came down to it I needed to make her better and that is what it took.

This is just my story to possible help you out some, none, some or all may apply to your life who knows but I believe in talking about teenage depression and getting help for parents that feel lost by it all.