That's an awesome site, Jenna. Many of the issues it addresses aren't unique to BP. I particularly related to the never-ending daydream; a long time ago, I nicknamed myself Walter Mitty. And the extreme sensitivity, overidentifying with the bug the little girl's brother is torturing, for example.
Anxiety and depression run in my family the way diabetes runs in some families. I've been living with both for so long that most of the time, I don't feel a stigma any more. I know that without medication, I'd be dead. I look at my meds as similar to a diabetic needing insulin. Even with the maximum medication, though, I have some really bad days, disabling days. Sometimes the depression and/or anxiety is powerful enough that it breaks through the meds (not surprisingly, that's called breakthrough anxiety/depression). Those times, I either need someone to talk me through it or I have to go to bed. These aren't weaknesses or wants; these are survival mechanisms.
The first year or so after my diagnosis (which was 13 years after I began having symptoms), I felt a strong stigma about being "mentally ill," but I was so relieved to be able to get out of bed and to not have to fear a full-blown, headed-to-the-ER panic attack every time I walked out the door - so I was more focused on that than on labels. The stigma, in fact, came more from people around me.
Now I have some days when I'm beating myself up, and among the many things I can throw at myself is the label "mentally ill." I still don't think it's a semantically incorrect label, but when I use it against myself, it's with a stigma that still exists in much of the general public. A large part of the public still flinches at the phrase "mental illness," though most of those same people probably wouldn't flinch at speficic diagnoses like "major depressive disorder" or "panic disorder."
Some people have said, "You're not mentally ill," but what they mean is that I'm not severely mentally ill. I'm not schizophrenic; I don't think light posts are talking to me. There are degrees, and I'm comfortable being open about my experiences, particularly if it can help someone else.
As for writing about it, just be as specific as possible, in name and symptoms, and otherwise treat your characters like any others. The more writers can normalize psychiatric illnesses, the less stigma will (I hope) become attached to them.
I'd be glad to discuss my personal experience with various meds and situations, if anyone has specific questions.
BTW, Jenna, your openness about your own anxiety disorder is part of what made me feel safe in this forum - I don't think I would've opened up if you hadn't led by example. Thank you