If he was on it only a couple of days, they I wouldn't worry. He was probably nervous because of the storm and the move. He'll calm down in a few days. Just give him plenty of turn out time, free choice grass hay, and water. Let his system clear out. After a week or so, you can decide on a feed plan for him, if he needs anything extra. Mine keep their weight on well with the hay we give, so I feed them just 1/2 scoop of alfalfa pellets a day with flax and a vitamin supplement. It works well and keeps everyone calm!!