scared DS - extra clingy

golfbride11

When I picked up DS from preschool yesterday, he hugged me and said, "I'm so happy you're here.  At rest time I had a dream you got dead."   Then this morning he was hugging me extra tight and said he didn't want to go to school because he was afraid he would feel like I was dead again.  I don't even know where he heard the word, "dead."  

He's been extra clingy and sort of baby talking, "mama" a lot these days.  Separation anxiety can come and go but I'm getting a little worried.

Have you gone through anything like this with your preschooler?