My DS is 2yo and had a bit of a tumble at a soft play centre this week. At first I thought he'd sprained/twisted his wrist so called 111 and on their advice looked after him at home. After a couple of days I wasn't happy with it and his nursery had mentioned it too so I took him to get it checked out. After a few hours and 2 X-rays they confirmed he'd broken his arm!! They were lovely about it and it's now in a temporary cast but I feel like the shittiest parent ever.
I can't believe he'd lived with it for days with little to no pain relief and that I hadn't noticed it sooner. He's been so so good and brave with it all but I still feel awful!! I feel sick for him every time I think about it and I'm scared of what it means for him 

How do I get him through it and how do I help him?