My girlfriend and I have been dating for about 8 years now. About two years into the relationship she was diagnosed with both Major Depressive Disorder and Borderline Personality Disorder. It's been rough but it hasn't affected how much I love her at all. I've always been my best to be supportive and try to help her.

Throughout the relationship she would have these flair ups where like she would become this different person. He views on sex would change, he views the relationship would change, and her interests would change. They would be short, anywhere from a day to a week, but once she was back she was fine for months on end.

Over the past couple years though she's been living in this more "flair up" state than not and right now she's almost like a completely different person. It's taken a huge toll on our relationship and she's more or less trying to force me out of her life one minute and asking me to stay and try to work on it the next. It's been near constant arguments and fighting.

She is on medicine for the MDD but is seeking no treatment whatsoever for the BPD. She also has hyperthyroidism and is taking medicine for that. Our last big fight was me begging her to go see a therapist. She argued that she didn't have the time or money being that we're both still in school. Then she outright told me she'll never go to a therapist again because she did it for a year in high school and never wants to do it again. Today, she told me she wants to try ayahuasca and start smoking marijuana because she thinks that it will help with both her MDD and BPD. I've done research and while I've found that marijuana is hit or miss with BPD ayahuasca is terrible for it. She thinks both are a great alternative to seeing a therapist and will cure her depression.

Basically, the advice I'm looking for is how do I deter her from making this decision and going through with it? I'm certain they will both really hurt her and make her far worse. Also, how can I convince her to try to see a therapist again? I'm really kind of desperate here because she isn't listening to me at all and she's really hurting herself and it's terrifying me that she'll make it so much worse. I mean, I'm losing sleep over this and it's just constant anxiety and panic attacks for me worrying about her. I really just need to help her and I don't know how. If anyone has any advice whatsoever, whether it's about what I asked or in general, please help.