It sounds like your medication isn't working well. BPD is hard to treat but if you have co-morbidities like depression, you can look into spravato or TMS therapy for that.
20s is a rough time. Not to discount you, but a lot of people struggle with identity. You got through the achievement hamster wheel only to be discarded by corporate America. Been there! I started my own business in my 30s and have never looked back.
Another recommendation - look into doing a vision seminar to find what drives you and gives you purpose. I did this one and it was really helpful after a rough break up with business partners:
https://rajikamahan.com/workshop