Separation anxiety

Awww, sweet little man is going through separation anxiety from Mommy. As soon as I turn to leave a room or I am out of his site he gets so upset. No problem he'll outgrow it, but tonight I put him to bed, he fell right to sleep and awoke about 1/2 hour later crying. I let him be for a few minutes as he never does this. I checked on him thinking maybe he couldn't find his blankie. He had his blankie, but was full out crying, tears and all. I went in and rubbed his tummy and told him he as okay. I put on his crib aquarium, said goodnight and left his room. He held his breath and then cried so much...poor lil guy ripped my heart out. I let him cry for a few minutes then went in again, he was so upset. I picked him up to hug him and he just hugged me back and rested his head on my shoulder, awww! He was fine, I just wanted to make sure! Daddy came in and talked to him and he started crying again, he said it's okay, Mommy's got you and JB turned his head away from Daddy and buried it into my neck and relaxed. I held him for a few minutes then put him back in his crib and rubbed his head. As soon as he hit the crib he cried for me, MAMMAAAMMAAMA! I told him he was just fine, Mama loved him, he had to go to sleep and I left. Oh, did he get upset. Anyway he cried less and less over the next few minutes and eventually fell back to sleep. He awoke a few minutes ago doing the same thing, but much briefer. Wow, what a feeling to be missed and loved so much by our little man!