How are his stools? A lot of the symptoms are similar to what we were seeing in Evan when he developed inflammatory bowel disease. The stools would be bloody, though--progressing to tar-like.
It could also be back pain related to the spine or even kidney malfunction. Very difficult, sometimes, to pinpoint a cause.
I know that helpless feeling while you're waiting for a diagnosis.
I hope you find some answers, soon!
