S.S.
As the mother of an ADD child, my first tip is: get help. My daughter's therapist is the most wonderful person. She has a way of suggesting coping strategies and helping my husband and me see what elements of our behaviour are helpful and which aren't without us feeling judged or critizised in any way. My daughter adores her.
The second: Find a mantra that helps you deal with the sometimes aggressive, diffcult elements of ADD. Something to repeat to calm yourself when tempers run hot. Mine is: She wants to but she can't. (control herself in some situations).
The third: Make a list of the positive sides of your daughter's personality. Sometimes we focus so much on the challenges, we can lose sight of the parts that make ADD kids so wonderfully creative and fun. Focus on the positive things 8 times, look at the negative things once, then move on.
And remember: AD(H)D is a challenge you can meet, not a death sentence, not a tragedy. You can do this.