I have done LCHF in the past but have gained weight recently (possibly after the joy of unrestricted diet after gallbladder removal!). Began again in earnest last week no problems. On Saturday and Sunday I felt dreadful and put this down to low carb 'flu', though have never experienced it before. Felt very low, headachey and hungover like. I have been on cerazette for a couple of years and periods had stopped completely for some time, until Monday when I start out of the blue. Is this a thing? Has low carb done something to my hormones??? Will it stop??? Anyone else experienced this?