I'm sorry if I'm butting in here, seeing as I don't know your full story, but I've had similar anxiety issues and maybe I can be of some help. First, I'm sorry you're having such a tough time with doctors. (It sure doesn't help the anxiety when they don't listen!)
Have you or your GP considered taking Buspar? I've been using it the past few months for Generalized Anxiety Disorder, which it IS intended for (it can also be used for OCD)--it's also helped my insomnia. The only side effects I've experienced are dry mouth, vivid dreams, and dizziness when I get up too fast from a sitting or lying down position. It can take from 2 to 4 weeks before you start noticing results; in the meantime, I don't see why the doc couldn't give you a benzodiazepene to use as needed--for any breakthrough anxiety or panic attacks. I have lorazepam for panic attacks, but I only use it 3 or 4 times a months.
Well, I hope this helps. Good luck w/ your doctor!