One of my children had an especially tough time with this and I have no way of knowing whether youve tried this or not so I am going to throw it out there in case you havent . We slvd the problem by drinking a small glass of prune juice at bedtime and eating an apple. Worked like a charm.Whenever he was severe( already been a week or so we would do this a couple of timesa day. After he was no longer constipated we would just drop down to a small glass at night again. We no longer have a problem and pick up the routine now only if there is a need. Stay on top of it- it seems that it gets worse the longer the child is having problems.Try to keep it from going on too long. goodluck.