I need help

I think I'm slipping into a depressive episode and the only person I can talk to about it is my best friend but she's going through shit in her life as well and every time I try to talk to her about mine she turns it back around to herself and her own issues. I text her saying that I'm having a breakdown and I need help and all she does is say "same" and then starts talking about herself. I've been her shoulder to cry on since her divorce 2 years ago. I've answered the phone at 2am when she was drunk and feeling messed up. I was waiting at home for her after she got back from a date with a guy that sexually assaulted her and I held her while she cried herself to sleep. I've listened to her, I've supported her, I've driven 2 hours to her house with a bottle of wine just so she would have someone to talk to and now I feel like she can't do the same for me. I just need help and she's the only one I can go to but she can't be there for me. I feel so alone...