I don't always check levels but I drink loadsIt could be anything to be honest. Do you test your BG levels when you feel like this? That could be informative. Are you drinking enough fluid - dehydration causes headaches and other feelings of weakness. If you are eating low carb are you consuming enough salt and other minerals?
I don't always check levels but I drink loads
Ok thanksChecking levels when you feel as you describe will tell you if it could be blood sugar related - too high or too low.