@cacampbell
That sounds like a good plan. How are they otherwise going to deal with a child losing a lot of weight? He’ll need to see a pediatric gastroenterologist- they usually are the ones dealing with a child’s inability to receive enough nutrition to thrive. At this point they have to evaluate him for physical abnormalities or his active growth at this age is going to stop.
Just keep pushing. Since you are in Canada doctors usually have to limit th amount of referrals- just like in Sweden where I grew up.
Keep us posted!