If you got him at 10:00AM this morning, you need to leave him alone. His entire world has changed, and suddenly he has some big ol' monster staring down at him and poking him, that's enough to scare anyone.
You need to give him a few days, with very little, if any disturbances, and don't try to feed him. After about three days you can feed him, I'd do that in a small container outside his tank, after he consumes the pinky, give him 20 minutes, then gently pick him up and put him back in. Then leave 48 hours before handling him. At that age, 5-10 minutes of handling a couple of times a week is all that they can manage. Make sure that your siblings/spouse/friends know the score too. As he grows then you can increase the handling time.
But for now, leave the little guy alone and don't keeping checking and watching him. I know it's hard, but if you leave him alone then that gives him chance to explore, drink and sleep undisturbed. Oh, and don't be surprised if you rarely see him, that's what happy Corns do most of the time (after their initial exploration period); sleep.
I hope that helps
David