I've had similar experiences but only since being on LT. Each time was after exercise or a sauna though so I attributed it to dehydration. I guess we've gotta be careful as our bodies are functioning on the minimum intact of calories (i.e. energy!) Good luck and enjoy your hols!
hope it went well at the GP chicky,
ooh - did you remember to pick up your eyes?
obv. i'll see you at work but i've got to get my post-count up somehow - lol