Tracy Morgan's Mom: Hospital Visit THWARTED -- Turned Away By His Fiancée

Tracy Morgan's estranged mother was turned away at the hospital when she first went to visit her critically injured son ... this according to the mother herself.

Alicia Warden -- who has had a well-publicized, strained relationship with Morgan -- tells TMZ no one called her about her son ... she heard about it on TV.

She says she went to visit Tracy in the hospital on Saturday, but was turned away by hospital security and Tracy's fiancee, Megan Wollover. Warden believes Tracy's fiancee has a thing against her.

Warden says she returned the next day and she was let in ... but Tracy was unconscious and she was only allowed to stay for 5 minutes -- never alone with him. She says his friends and a pastor were in the room.

Warden says, "All I wanted was for our family to be alone with him. I wanted to pray over him and couldn’t do that because so many people were in the room."