Hello -
If you are vomiting along with it I would def go to the neurologist and have it checked out - possibly even a gastro doctor. This is the route I am wanting to take with my child now - going to a gastro specialist - as the neurologist has not seen any of this as an issue. We do go in for another CT and Xray series in two weeks, just routine follow up - if we find out anything I will post here.
My husband and I have been discussing this very issue the past few weeks- and he has mentioned it more than once in the past year. I had a shunt put in- 31 years ago- I am now 42. I have always had bowel issues as long as I can remember, constipation same as you explain with your child. I am now having huge gas issues as well. Stomach swelling til I thnk it will pop, and then vomiting to rid myself of the pain. Nearly anything as much or as little as I eat, will make me gas up. I was searching here to see if there is a connection- something I have never thought of before for some reason- and saw only your post