I feel exhausted just reading what you've written. I can't imagine how you must be feeling. That sense of having relapsed back into the old anxiety must be very discouraging, compounded by the different opinions you have received from medical professionals.
Having major changes in your life and routine in the last three months certainly sounds like reason for anyone to slip back. My question to you would be, how did you deal with the anxiety the last time? If something worked then, could it work again now?
Has your GP prescribed you medication to help you sleep? I'm concerned that by sleeping so little, you're not helping yourself recover at all. I know you are frustrated with medical professionals right now, but it's also important not to let your health suffer because of this frustration, because it'd only get harder for you to deal with the anxiety if your body is constantly tired and weak.