Been drinking energy drinks consistently passed week n a half. going cold turkey. how long will withdrawal symptoms like fogginess and headaches last?

Hard to predict: Many of these have caffeine or other brain stimulants in their mix. Depending on the duration of use and volume per day you may set yourself up for some significant symptoms. Caffeine withdrawal can trigger migraine equivalent headaches for a week or so when you cold turkey. If you gradually cut back, it is less likely to be a problem.