yep - i'm SURE that if you're having your first one of these horrible surges, your body WILL react with blind panic, which only fuels the whole merry-go-round and hey presto, you're momentarily crazy woman who wants to dial 999!!!
I have to say the last bad attack I had, I totally told myself about all the replies to this thread, and said 'it's only adrenaline' and paced around for a while, but tried to really 'ride the wave' of it and just feel it happen, but not go through the whole 'oh my goodness what is this, what is happening ..... etc etc' and it DID help in that the panic wave hit me, climaxed and then just kind of went away and I managed a lot better.
Silly as it sounds, I find also that if I get a hand held fan and fan myself while it happens, it gives me something to do and help pass the seconds until it subsides. I'm not actually hot, but the act of moving the hand rather vigorously helps to displace the fear a bit at least.