Briggy's seems to have given you lots of good advice (as usual BG ) but I just wanted to add my two cents worth as well. I've been getting more headaches as things progress and have managed to avoid taking panadol so far as I find either water or food helps. I'm guessing I'm either a little dehydrated or my blood sugars have dropped. Water or juice have worked wonders for me and I always try for carbs if I think food is needed - a cheese sandwich, crackers, fruit, etc.