Hi Nightcat - or anyone else who might be able to help.
Been to see the paediatrician today for the results of ds1's stool samples - take a fortnight ago.
Apparently the enzyme results had to be sent of to a lab the other end of the country and aren't back yet and the pathogen test didn't turn up any nasty organisms, but while we were there the paediatrician said he'd look over the bloods taken by the GP back in late June, when we discovered ds's weightloss.
At the time we were told his bloods were all fine - but I know from past conversations with several GPs at the surgery that the results for children always come through as adult results and there is only one GP that's any good at interpreting them. 
So, today we found out that ds1 (who is a vegetarian, btw) has raised protein, esinophils and B12.
The paed did say that the esonophils could have been related to ds's very mild hay-fever - but iirc ds wasn't actually suffering when the bloods were taken.
He didn't seem to think the raised protein or B12 were likely to be a big problem, despite admitting that they are anomalous for vegetarian results, but wants to see what the enzyme results turn up.
I have googled a little (I know, I know) but have stopped because I don't want to scare myself and - as is the way - the first couple of links looked pretty scary.
The paed is going to call me with the enzyme results and send out a follow up appointment to review him in a couple of months.
From what I can make out, it could, possibly, be related to a liver problem - which, if it is the case, I suppose would be confirmed by the stool/enzyme results when they come in.
In the meantime, any thoughts on what we have so far? Ds's weight has dropped a pound and a half in the two weeks since he was last seen at the hospital - although he has had a fluey bug in the meantime - and he still has a painful abdomen, intermittent diarrhoea and regular-ish episodes which he describes as 'raging pain'. 