Be sure to try what Justin suggested about getting him into some water - for about 1/2 an hour. We visited with Justin today (Deb, Judy and myself) and we actually talked about this guy and he said that when a baby isn't getting hydrated from the nourishment, it looks like it's "collapsed", but when he's offered them water by putting them in it, they'll drink and drink and drink, and re-bound.
Not saying that this little guy will do so, but it's certainly worth trying!