DD2 has lots of history - she was born with an imperforate anus, had a colostomy done at 3 days old and reversal at 6 months. Has struggled with constipation ever since. We were giving her movicol every day until May when the consultant said to give her a suppository every other day. She is almost 4 now.
We stopped doing the suppositories a few weeks ago as it was just too stressful for both Cerys and I. Also, it wasn't keeping her clean the remainder of the time which, from what I can gather, was the whole point of doing them.
I decided not to reintroduce the movicol because she continued to be rather loose and would explode every couple of days - almost like her bowels had been trained to do so... 
Last week I noticed she did a couple of pebbles one afternoon and nothing else, so gave her a suppository the next morning as she clearly needed to be emptied out. She then continued to go every couple of days as before.
The day before yesterday she had a few pebbles and I made a decision in my head to do a suppository yesterday if she hadn't emptied. I'm such an awful mother, I didn't do it as we had lots going on, were moving her room around and coping with this cyst on my ovary etc. Last night she was straining and said it hurt, so I thought "right, first thing in the morning we will have to do one".
This morning DH got up with her and when I came down late morning, he said she'd been crying and asking for the 'sore thing' as her tummy hurt. I put a suppository in but nothing came out. I could feel there is lots in there and it's hard, but all she did was cry and strain. So after two hours of it, I put another one in. So far she has had two lumps come out, but she's on the settee telling me she doesn't feel well and every now and then she cries and strains. I'm rubbing her tummy and back and lifting up her knees, I'm getting extremely worried now - how on earth am I going to get this poo to come out!? The consultant always said she would have to go no longer than 48hrs between poos, it's gone over that technically. Do I ring the emergency gp? Bless her, I can't bear to see her go through this especially knowing I could have prevented it if I gave her the suppository yesterday
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Please help! I'm going to copy this into childrens health too...