Hi there, you are not the first and will not be the last that this has happened to.
Put it down to one of thise things, see if there are ways to prevent it in future.
And if you look at Levemir's action on insulin, ( google pictures of Levemir profile) you can see the type of way it affects bsls, gradual, fairly flat compared to short-acting insulin.
So. In this situation in the past i checked my BSLs every 2 hours, had some eggs and bacon and waited.
No need for high carby foods just 'slow-acting carbs - some full fat yoghurt, that type of thing.
The next morning, easing back the shirt-acting insulin dose but keeping the morning Levemir the same and keep two hourly resting. i called in sick for work and allowed time for hings to settle.
Go easy on yourself !