I would hope that if this man is your Master that the relationship you have with him goes beyond sex. If that is the case then perhaps what would be best for him right now is to just have you near. For you to sit at his feet and lean against his leg and just let him enjoy your touch. We all put our own needs on the back burner when someone we care about is hurting. (at least i do). There is so much healing power in just touching another human, especially one we cherish, when we are down. If you are calm and act as a kind of touch stone for him while he is not at his best then you will probably find that when he's better, you will have a much stronger bond with him than you had to begin with. Just be patient. If he is hurting as bad as you say then this is the time to put his needs first.