Leave the snake alone. If he is going to shed, then he is in a very stressful state. I would not worry about feeding him since he seems to be very defensive at the time.

EDIT: Put him back in the enclosure first. I missed the part about him being on the floor. Next time put him in a little box or tub when you are cleaning....the open space of the floor is probably making the little one feel very open to attacks from preditors and very very nervous.