no point in sending a stool sample, as lactose intolerance won't show up there, there is no actual test for Lactose intolerance, only observation
I have similar problems with my DD, who is now 8 & as a result now has an IBS diagnosis, though Gastro Paed did say as she wasn't having a flare up & I mostly have it under control it wasn't possible to say whether or not it could actually by Crohns, which was suggested by an A&E Dr, as she had colitis when seen there.
I've had quite a few bouts of out of control diareah & stomach pain with her, weight loss & vit deficiency signs included:( so over the years have come to realise what helps & what doesn't & what her triggers are, so MOSTLY she doesn't suffer to badly :)
DD IS definitely lactose intolerant, & during a flare up, also cannot eat Wheat or ANY Diary, normal times she can eat a little wheat & all dairy bar milk, so she drinks lactofree....she is also very sensitive to food additives, things like MSG, Benzoate preservatives, some colours, & artificial sweetners will ALL set off diareah, nausea & pain, so we avoid these all the time.
with her, my tried & tested plan of action during a bad flare ...ongoing diareah & pain......until settled completely
Avoid all Diary,
Avoid wheat
Avoid High roughage Foods(the healthy brown stuff & fruit veg)
& for a couple of days, give a very bland diet of fish & white rice cooked in the spice Turmeric (Turmeric is a natural anti inflamitory & will help settle an inflamed colon, so ease pain & diareah)
after the first few days avoid high roughage foods, wheat & diary, & as things start to settle re-introduce veg, & white meats such as Chicken & a little (white) wheat, but avoid dairy & acidic fruits until completely settled.
also give him some Veridian Childrens stomach flora, it will replace the good bacteria & help his gut re balance itself, its a powder & can be mixed with anything :)
When it settles completely re -introduce all foods, but if Lactose intolerance has been suggested, then get lactofree or non diary milk for a while longer
My own DD became lactose intolerant after a bout of diareah etc after having heavy duty antibiotics, & it stayed with her, those as I say, during "well" phases it is only milk she can't tolerate.
also let him have crisps & coke (NOT sugar free) & add some epsom salts to his bath for magnesium.....this will all help replace the tissue salts he is losing
Hope that helps,
some of it might sound extreme & go against all you know as far as nutrition etc, but if its only for a very short while it won't harm & will give his guts a rest & time to heal themselves....I was at my wits end with DDs last bad ongoing bout, after more anti biotics, nothing worked :( GP no help, & she was in such a state, the fish, rice & tumeric, with Veridian powder added to chocolte shake made from Coconut milk & cocoa got her over the worst of it in 2 days :)