My 5 year old ds has recently started getting out of bed at night. It all began when he saw a scary Panto which we have now overcome but it now ranges from not wanting to be on his own to being scared of the dark. He’ll get up around 10-20 times a night. And it’s never a peaceful affair, he starts crying and screaming, which makes me start crying and screaming 
I am making things 10 tens worse and I don’t know what else to do, I say some horrible things that probably just make him feel even more scared and unsafe, things like he’lol have to go and leave at grandmas or daddy can’t leave here anymore as he keeps waking him (dh has to go work at 4am) I really have tried being nice, talking about his worries and reassuring him but after a few nights it all reverts back to this horrible screaming at each other. I hate that he sees me like that and last night I was crying again pleading with him to stay in bed, he told me to stop crying for god sake and he wanted his real mummy back I am heartbroken and desperate for help. I do have an 8 week old dd so I do believe this and starting year 1 at school is all contributing to his anxieties/insecurities, I just feel out of my depth.