MOMMIES, I NEED SOMETHING...ANYTHING....

My daughter is having a hard time dealing with her current tummy troubles & we have all hit a point to were we are at a loss to help. Here is the situation ::

She has been potty trained since she was 2, besides the random "sick" moments where she would have poop accidents. We noticed that she started having regular accidents of both, so we had her checked for bladder n kidney infections which was clear. So we took her to Vanderbilt and found through xray that she extremely constipated (showed no signs like normal, even was seen by 3 doctors who was surprised). We had no choice but to put her in pull-ups bc the medicine, but since she started having the accidents she has fell apart emotionally, she has went to screaming, kicking, hitting, biting, throwing full blown fits to were we don't want to go anywhere bc we never no what or when she is going to lose it. The fits are continuing to get worse each day, she is even starting to have issue at preschool to the point I'm having phone calls because they can't handle/control when the fit starts. We have tried time out, talked to her, take stuff away, gave her attention (thinking new baby syndrome), etc. nothing seems to help!