I think my 12 year old has PMDD

She has all the textbook signs. She started her period at 9 and has been having a period for 3 years but it seems like just the last year I have noticed the extreme switch in moodiness and depression. She mentioned wanting to die, she cant concentrate in school , is extra sensitive and wants to eat nothing but garbage like a week and a half before her period. Im so lost because I dont want to medicate my baby :( And i feel guilty because I know this came from me because I have it. Does anyone else have a child with our condition? How are you helping her or what things have you found to help her?