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Just a guess, but could this be food poisoning? My h had something similar a while back with blood in faeces and terrible stomach pains.
Poor ds. Hope your doc is helpful and your ds feels better soon.
God, nhs direct are either 'he's fine' or 'go to a & e' ime. I wouldn't have taken him before now either ks, bet it's just a bug and he'll be better in a couple of days but take him tomorrow to be reassured. Poor love, hope he's better soon.
Flat coke is excellent, the phosphorus in it is good for the stomach i was told (by a doc). To make it go flat instantly drop a pinch of sugar in it. If you haven't got coke then flat lemonade will do, but it isn't as good.
I was also told by another gp that the water from boiled rice is good to drink when you have had the runs, but could never quite bring myself to give it to the kids, it looked so rotten!
I would be worried it was a bug too and I do agree with everyone--especially about leaving food for at least 24 hours after his last vomiting. Aciodophllis (can't spell either) can help to rebuild the bacteria in the intestinal tract, but I wouldn't try to add anything until you've given his system a complete rest (so hard to do). He still needs liquids to keep the kidneys going. I hope he feels better soon KS.