If you had a lot of carbs the past week, don't mind the headaches, its your body riding the excess sugar and causing heachaches

- day 1-3 days max

Diarrhea is caused when you have been on carnivore for about a few days, its the body processing fat without anything to combine it with like breads

- days 5-7 max

After that you'll feel like a superhuman

Bonus

If you want to continue for awhile, be sure to consume all the parts of the animal, to get all your nutrients, vitamins, etc. It can be done. Liver is excellent like 1-4 times/ mo.