Exhausted with a 10m old

He is just so clingy. He was able to play on his own for 10-15m until we hit a 9m sleep regression (it was bad). Now night sleep improved, but during the day he is soooo needy. Constantly needs to be entertained by ME. I can't leave him out of sight for 5min cause he starts to absolutely scream and cry. I guess it's the separation anxiety. but jesus it makes my blood boil every time he is totally content playing with his toys, and starts a screaming fest once I just get up off the floor to make some coffee.