Firstly, if you are worried then do call NHS Direct for proper medical advice.
Wash your hands and re test to check it's an accurate reading. If you have some test solution may be worth checking your meter to check it's ok.
Have you been instructed how to do corrections to bring your levels down? If so then follow those rules. Most meters only read hi when they're in the 30s, but might be worth checking your manual to see what yours goes up to.
It's worth checking for ketones too if you can.
How long is it since you last ate/injected? What was your last reading before this one?