Every cleanse is different. Some fly by and you feel great the whole time, occasionally you get whacked by a crisis. The body unloads toxins in a certain order, and you never know.
However, I always appreciate a serious crisis like this, knowing that I truly needed the cleanse and that this will prevent future health problems by removing toxic waste before trouble starts.
If you NEED the cleanse, DO the cleanse! Set your mind that you are going to do this for your body and appreciate the work you are doing for yourself. Of COURSE you would rather be scarfing a burger and fries with a pitcher of cold beer... but you can do that LATER, as part of a sensible diet (occasional treats don't get us in trouble--a constant junk diet does). I assure you, the food will still be there when you are ready for it.