17 Year Old Daughter with BPD

My 17 year old daughter was diagnosed with Borderline Personality Disorder several months ago. Our family has gone through so much since November of last year because of her disorder. She’s been in and out of mental health hospitals, and still continues to self-harm. She gets very anxious and has panic attacks and takes out her anger and frustrations on anyone in her way. She thinks the world is against her, and gets so upset when things don’t go her way. She takes medication to help control her moods, but they don’t seem to be helping all that much. She was living with her dad (we’re divorced) for a few months, and has now returned to live with me. I’m working on getting her into therapy. I’m at my wits end because I feel like I don’t know what to say to her or how to act around her. Also it doesn’t help that I’m 35 weeks pregnant and have a 12 year old who also needs me. I feel like her disorder takes everything out of me. I mean she’ll get mad if my husband and I are joking around having a good time around her when she’s in a bad mood. It’s like walking on eggshells. I’m constantly worried about what she’s going to do to herself the next time she’s upset. My biggest concern right now is getting her through her senior year of high school which she is starting tomorrow, but I’m terrified of her becoming too overwhelmed to finish or ending up back in the hospital, I don’t have anyone to talk to about this who really understands what this is like. If anyone has advice, preferably experience with this, please let me know your opinion or advice. TIA