Metformin is a build up drug not a fast acting one so missing one dose will not have any effect. I occasionally miss a dose and it makes no difference- glad you had a good night out
it is almost Christmas after all - your numbers were normal (apart from your fasting you don't say what they are so I'm assuming they were below 7) but they were just a snapshot you may have been a lot higher or in fact lower during your night out. We all have a blow out once in a while we are only human and we have a life to live BUT don't let getting away with it once lull you into a false sense of security and tempt you to do it more often - that can be our downfall