It sounds like a condition my grandmother has called diverticulitis syndrome. Her diet sounds very similar to your sons.

I would go back to your GP & get a referral to a bowel specialist to get your son checked out. GP's are just that - general practitioners. Whilst they may have an interest in specific fields, they aren't specialists in them. I found that out when I asked a peadiatrician about my DD haemangiona & he gave me incorrect information. It wasn't until I went to the specialist that he gave me the correct information.

HTH & GL
thats what DH had, the diverticulitis! i knew it was diver something

sweet, ill try and talk DH into it now, pity he doesnt realise its easier to deal with things when u know exactly whats wrong with you

thanks!