Have been put on Movicol for thrillingly bad constipation that have posted about on here before, been trying to get the dose right since started on Monday. 2/3 sachets had no effect whatsoever so y'day evening I went for the big one and took 4 in one go. Lo and behold, success this morning, the biggest BM I've had in about 6 weeks. However, now I don't know what to do! I still feel constipated and now it's later in the day I'm back to my previous situation of trying to squeeze out hard poo!! 
Do I assume y'day's big dose will continue to have an effect throughout the day, if I just leave it for a few hours, or do i need to have another dose, either similar or a bit less, to keep up the momentum?
I'm obsessing about what I eat too - Movicol seemed to have much more impact the first day I took it (at lowish dose) because (I think) I'd only eaten fruit and juices for 2 days previously. Scared that if I eat normally it'll have less effect. But I'm aware that I should probably try to eat normally - my diet isn't bad and I don't think is cause of the original problem.
Sorry for TMI