2 year old sleep regression??

Anybody else’s 2 year old going or did go through a sleep regression? My son is usually a GREAT sleeper. In a toddler bed by 15 months, sleeping from 9pm-9am with a 3 hour nap around 2:30. Now the minute I walk out of his room and close the door he screams bloody murder until I come to get him. He’ll fall asleep for about 10 minutes, then wake up scream for a while and repeat. I’m not sure if it’s a regression or if he’s actually scared of something... because, he will come to our room and sleep just fine(if we would let him) all I know is I work third shift already as well as have a 4 month old, so not getting to sleep on my days off is killing me😴