Don't worry, I had it for about the first week, then it was fine.
It's all of the nutrients you're getting in one go, your body will get used to it. My consultant said I could do half a pack at a time initially so its not such a shock to the system x
Hi Sadie i had a real dodgy tummy for first few days and then it went .. Now tho i have trouble being able to go so have had to get the cd fibre. Think like Jesicacaca said its just your body getting used to the change. Hope things get better soon for you .