I have done two master cleanses in the past. I just finished my second last week (13 days). Alot of people, including me, get the horrible headaches for a couple of days. It does pass. You will have good days and bad. I wouldn't say I ever had a certain day when things got better and stayed better. It really changes hour to hour. Stick with it!! The benefits are well worth it. I'm sure you'll make it.