DS1 has been trying to pass a stool since 4.30am. He seems to be in quite a bit of pain (can't stand quite a lot of the time, sort of kneeling on all 4s). He now has kind of what looks like water falling out (sorry tmi I know), with some frothy bits in. He did pass more diarrhoea type stuff earlier, but it's become increasingly like a constant drip of water.
Any advice please- anything I can use to get him moving? It will be very difficult to get him examined anywhere (he's severely autistic).