I realise this is a very old question, but I just wanted to clarify that you can't suddenly develop ADHD out of the blue, it's something that is present since childhood. There could be a number of possible explanations for suddenly developing these symptoms, but ADHD is not one of them. If something like this happens once it's probably nothing to worry about, but if it happens frequently get a doctor's opinion.
it could be attention deficit disorder.you should go to a doctor if this continues.