I started my diet yesterday 11-2 and woke up this morning with severe head aches. How long do these last for? I'm scheduled for my surgery on the 16th and hope these don't last too long! What do you take to help? I stopped drinking about 2 months ago, at the same time i stopped smoking marijuana, cut coffee and pretty much any caffeine in hopes to stop this from happening. Not sure what else could be causing these