DS (12 months old) hasn't pooed for 11 days. On day 6 I called the GP and got a prescription for lactulose, which we've been giving ever since, but with no joy. He is trying to go occasionally but with no success. He's getting increasingly grumpy, but is also teething so I don't know how much of it is down to being constipated. He's not been vomiting, has been off his food for a while but is still eating a little. His abdomen doesn't feel hard. The last time he went it was normal consistency, but absolutely massive, so I'm concerned he's withholding and don't want him to do himself lasting damage.
Do I call 111 today or leave it until I can get him to the GP tomorrow?