No not worried- but it does mean you are a little dehydrated and need to drink more. Ketosis is what you want but to be at the higher end all of the time is not the idea. If you fell unwell with a headache and no energy then this is part of the process of your body transferring from burning glucose for energy to burning fat. You will probably feel much better tomorrow as my episode like this only lasted 2 days. Hope you feel better soon. x