is it normal to have a slight headache? I'm about 5-6 days in.....
Yes definitely. It's a symptom of what they call the "low carb flu". The first time I tried keto after a lifetime of carb-centric diet, I was literally in bed for 3 days and could barely walk. Fat adaptation is a weird thing at first, hang in there. I find drinking salt water first thing in the morning helps.