Title says it all really! This has started in the last few weeks and it differs slightly from the typical separation anxiety in that he's not really bothered whether it's me or my husband with him. He's equally happy to be left with friends, family, and he goes to nursery 3 days a week and is happy there. But the minute he's left in the room on his own - or sometimes even if we stand up and walk to the other side of the room - he starts screaming. His keyworker at nursery says he does exactly the same thing with them.
Any advice on how to handle and how long it is likely to last? I don't know whether it's best to try to be with him as much as possible to increase his sense of security, or just leave him when I have to (obviously not just to be mean, but when I need to go somewhere else in the house anyway) in the hope that he'll get used to it.
Any experience anyone?