I also suffer from chronic feelings of loneliness, and it's this that is causing my T to possibly add the diagnosis of Borderline to my BPII.

I am BPII, and definitely suffer from depression more than hypomania. But by adding an anti-depressant to my meds, I've managed to stay away from major depression for a few weeks now (Long may it continue)

'An Unquiet Mind' seemed to focus more on the mania, which I could not relate to at all.
I also have the Bipolar Workbook at home, but have not worked on it much. I have a book on depression and bipolar, which I find very useful though.