Stopped drinking Energy Drinks 3 days ago, when will the headache stop?

I have been drinking Red Bull on and off for about 3 years, usually one, max 2 a day. No other caffeine, only water. I am 35 years old and wanted to quit for health reason. I quit cold turkey and omg! The headache and fatigue is killing me! I need a nap mid day… it feels like an ongoing hangover. Any tips or ideas when will this end?