It might be possible that his own guilty conscience is responsible for some of the stress that lead up to this event. However, again, this is hardly impossible to predict. Even I, with no divine powers whatsoever, predicted that Camping would use ridiculous apologetics to explain away the failure of his prediction and I also predicted that he was banking on the possibility that he would not be alive in few months when he has re-predicted the end of the world. He is on track to fulfill that prophecy with this latest incident, which will be too bad, because I would like him to live long enough to see that prophecy fail too and perhaps even to be sued or indicted for the scam that he perpetrated.
By the way, I hope this guy doesn't go to the hospital for treatment, because the Bible teaches that faith-healing is sufficient to fix you right up. This guy should have the courage of his convictions, and show us whether he really believes the swill he's slinging by refusing to use modern medicine. If he is miraculously cured, that might help to rehabilitate his reputation.