DS is 2.6 and is writhing in agony every time he does a poo. It all started 4 weeks ago when he was ill and didn't eat for a few days. After he was better he did an enormous poo which I think hurt him and we're now in a vicious cycle of him holding the poo in because he thinks it will hurt. He's been having Lactulose for the past 3 weeks and his poos are soft, so he's not constipated.
When he gets the urge he tenses up, writhes around, starts crying (today he's been almost screaming) and finally passes a tiny poo. When I change his nappy I can see that he hasn't completely emptied his bowels and half an hour later we go through the same thing again. I've been trying to explain that if he does a big poo he'll feel better, but he's just relieving the immediate pressure.
I'm getting really stressed and it's horrible to see him in pain. I don't know whether to take him to our GP (who is usually very dissmissive) since it seems to be a behaviourial thing rather than medical. Is this a phase that will pass or should I be seeking professional help? :(