It can be very difficult to discern between rapid cycling bipolar and Borderline Personality Disorder (BPD). Some mental health providers cannot agree on the discernment between these two diagnoses.
I don't believe we can accurately help you to discern this online.
A qualified mental health professional following you closely, getting to know your patterns, is most helpful in discerning diagnoses.
I hope you find the info. and answers you are seeking.

WC