My heart is hammering in my chest and can't get hold of anyone to just talk it through to calm me down.
DS is a very immature 2.5 year old with speech delay. Came back from shopping, refused to nap so brought him back downstairs and he was messing about with the TV and his toys whilst I was cleaning and gutting 6 fish!!! I thought it had gone a bit quiet but we have a huge storm here at the moment and lots of things were clattering about outside so I didn't hear the front door go.
I finished with the fish came into the living room and there was no one there. I ran in and out every room of the house in total silence and each one was empty. I was trying to decide whether to ring the police when I opened the front door and he was out there playing with stones with the wind galing all about him 
He did this once before ages ago and got a big telling off and hasn't done it since. We have UPVC doors and I need to lock it from the inside to secure it and I didn't. I honestly honestly hate myself. I don't even know how long he was out there for as I was so caught up in my kitchen task. Fucking hell he is my only child, I can't have anymore and I nearly lost him. I don't know how I'm not sobbing right now, I think I'm
In total shock. I will never leave that bloody door unlocked again. Terrifying.