It took two paramedics and another guy from the gathered crowd to pull Dean away from Sam. The medics threatened him, if he interfered with their work. He grumbled and groaned, but he respected their space until they put Sam in the squad, and he insisted on going with them.
He sent a brief message to Amy because Sam requested that he let her know what had happened. No way was he going to all her. He didn't handle his own emotions well, he wasn't about to try and deal with someone else's.
If Sam died, and Dean wasn't willing to entertain the idea, but if it happened, and Sam was really and truly lost to him, Amy and Lizzie would be the last connection to him. Amy owned all those years Dean had lost with Sam, and Dean couldn't deal with that right now. He needed to stay focused on Sam.
"I'm not going anywhere,, Sammy," he murmured. He held tight to Sam's hand, until the rig pulled up to the back door of the hospital and the medics wheeled Sam away. Dean followed them, his phone held in his hand so he could respond to Amy's messages.