Thats good re his diet, though not so good for an easy answer
Re your mention of less pain with no bread - wheat is one of the more difficult to digest foods, it can affect a lot of people, especially if their digestive system is already under any stress, so it's not necessarily the actual bread that is the cause, but it could make it all worse IYSWIM
When my own DDs IBS flares up - for example a while back she was having a lot of problems at school, (bullying from her friends & we had to drag that out of her too :( ) - she gets the opposite problem with bad stomach pain & bouts of diarreah - I've learned that to help it settle down quickly & take the pressure of her digestive system, you maybe need to cut out the hard to digest foods for a little while - so no wheat & diary & also meat if he eats it - I've seen the hospital Nutritionist with DD, (referred by the Gastro) & she agreed that was the right thing to do?.. also, IF its white bread that your DS is eating, then that along with white rice, pasta etc are all bulking foods - bread most so -
so if it is constipation - that could be why he;s better without bread - either its just his system is overloaded & can't cope with difficult foods - OR white bread is bunging him up more
The Nutritionalist did say that apple juice is the most laxative of fruit juices - it was the only thing we were doing wrong, as we'd wrongly presumed orange & were letting her drink apple instead
Sooo - maybe try getting him to drink lots of apple juice, from what we were told at the hospital - it could help soften things for him
I would say more food roughage too, just until he sees a medic - but if it is a blockage, that might not be such a good idea - but apple juice might be worth a try
& yes, we have that problem getting a GP appointment too, but I was given a great tip by a friend who works at a different surgery - when they say no appointments left - tell them you need an emergency appointment - it's not the same as emergency for A&E, just means you need seeing quickly - which by the sounds of it, he does - they then have to fit you in
I really hope you get it sorted out soon, its no fun for either of you :(