That's extremely high. You need to take your insulin- if you have extremely fast acting insulin, like novolog, use it! If you' don't, call 911.
In the future, keep better control of your levels! CF-related diabetes can greatly lower an already decreased life span.. you're playing games with your life.
(For the brilliant person answering underneath me, she's using mmol/l, making her blood sugar about 400 mg/dl- the only thing telling her to drink orange juice would do is send her into a coma.)