According to my endocrinologist, there was a worldwide shortage of thyrogen but it's recently come back into stock. I had a bit of trouble tracking it down, but got it in the end. So, hopefully you don't need it again, but if you do, you probably will be able to find it. I can't imagine having to go completely hypo, you poor thing. I think it does screw your body up for a while.
I was at the RPA in camperdown and the staff there were great too. I had a HUGE room with windows all down one side, and of course didn't have to share with three others like after you have surgery. I live in Canberra now, not sure what the isolation rooms look like but fingers crossed I don't have to find out!!