Idealization/devaluation, rapid changes in ambition, rages – all of this can be symptoms of BPD. However, you might or might not have it, we are no professionals so can't help you that much or diagnose you. I think you did the right thing in sending a similar letter to your psychologist, though it seems strange to me she hasn't had a reaction yet.

I think, if BPD is what you think you might have, you should ask your therapists to explore the possibility and perhaps give you more accurate tests.

I can only tell you that BPD is sometimes difficult to diagnose, also because mental health professionals are sometimes the first ones to stigmatize the diagnosis and so prefer not to diagnose it at all. It took me 13 years to get the right diagnosis of BPD, and I know of other people who had to wait many years too.