Separation anxiety?

My little one has just started going to a childminder as I'm going back to work next week ☹️ and he seems to be enjoying it but at night he has been waking up every 1.5/2 hours crying and clinging onto me when I go and settle him and just wants to sleep in our bed. He seems fine during the day. I try to reassure him before bed that if he wakes and he can't see me that I'm watching on the monitor and he points at it showing the green light but doesn't stop him being distraught when he wakes up. Has anyone else experienced this type of thing? Any tips on how to handle it?