GIlr help? Its about my period and menstral cycle.?

Okay so i'm 17. I started my period for the first time when I was 12. I never really had problems with it. I usually have al ight easy bleed for a few days and about it. When I have PMS i get crabby and angry and I have the seriuos munchies. Lately for the past few months I've been really really depressed when I PMS and continue with cravings and munchies. I also break out more then I usually do. I know gonig to the doctor might be a good idea, wekll a no duh idea but I dont want to go just just yet. Any ideas or help. Also my mom suffers from bi-polar disorder that has severly affected our family. i dont know if this is something that can get ped down to me, this also scares me. I would appriciate any help and thoughful advice. Thanks