My 6mo has mad separation anxiety, what should I do?

Dazed0N0Confused
My son (6mo) cries every time one of his favorite people (dad, grandma or myself) leave the room, even if he's being held. He's always been "cuddly", as the nurses would say while we were both under routine observation after his birth, but this whole "crying when I can't see grandma/dad/mom” is new.
We have to distract him when someone else leaves the room or hear him screaming. When we're (baby & I) alone with him the only option is to hear him scream so I can use the potty, sometimes I bring him with me & put him in one of his chairs, but I try to leave him alone most of the time.
Grammie watched baby so daddy & I could have a date night, it was very close to bedtime, and my mom said he freaked out when we left. She said he would cry for a few minutes, stop to look around to see if I would come get him & did this several times before he seemed to come to terms that he was alone with Grammie.
It's worse closer to nap & sleep times.
Any advice on how to curve his separation anxiety?
My 6mo has mad separation anxiety, what should I do?
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