I deliberated about whether to post this here, as it's not B12 deficiency or PA related, but this support group has helped me so much over the last couple of months, I thought it might be of interest to some.
I watched this movie today - Brain on Fire - about a young woman who suddenly develops a range of unrelated symptoms (similar to those of us with B12 deficiency, actually) and her family's struggle to find a doctor who doesn't give in, but will continue to investigate until an answer is found.
PS If you want to watch it in full screen version, just search Brain on Fire movie on YouTube (it only appears half size on this page).