Some horses are just more susceptible to colic. It would help if you could figure out why. But doing a bit of research on colic might help so you can use preventive measures to stop it happening again.
Try not to turn out in a sand arena, don't feed large meals, leave a good space between feeding and riding, keep him fit if possible and no sudden changes in routine. But I have heard that some horses react to change in weather badly so if you could keep him in at night that might help