Tie and gag him into a position that is optimal for your comfort (not for his) and do it whenever you feel like it. Slap his balls a few times in between to assure him that his pleasure certainly isn't what matters and he is in absolutely no position of power.
You did the right thing, because a if the slave is no use to You and throwing up everywhere it certainly doesn't deserve to be in Your presence until it's fit to serve You again and certainly doesn't deserve any punishments. Just have him work double time when he's better.