Since I was already diagnosed with BPD many professionals didn't think I had bipolar. I never told anyone about the manias, either. I may have had an inkling of it but it wasn't until after I was started going through perimenopause in my 40s that other people noticed. It wasn't until my former pdoc put me on a mood stabilizer instead of yet another antidepressant that I had bipolar. And I started feeling better.