Help:23 mo and Terrified of the dark/sleep

I need help. Yesterday my son screamed and cried when I was about to put him down for his nap. He is usually a great sleeper, always took naps and in bed by 8. Out of nowhere he just was plain old terrified of me living him in his crib to nap. He wanted his blinds open and even refused his pacifier so he wouldn't stay in the room. He pointed at out baby camera and I asked him if he was scared/didn't like it and he said yes, so I thought maybe I scared him by accident when I told him (not meaning to scare him) that if he needed me I was there to watch him.

Well night time came and boy that was rough it took me 3 hours to finally settle him down and he fell asleep in my arms because every time I would attempt to place him in the crib he would wake up and scream.

On side note he recently watched (about 1 week ago) Nemo for the first time and I noticed some parts he clearly jumped and got scared... Did I do this to him??? What should I do?