In the context of your recent two posts where you were dealing with some tough jealousy issues and then when you asked for a rule that if one of the triad is upset, then the other two shouldn't have sex, I'm wondering if the husband is conflating those events with the emergence of the sick child.
Perhaps you two could talk and you can help him separate the issues. He could need reassurance from you that they are unrelated. You probably want reassurance that he'll be more responsive in the future. You and he could strategize for the next time when sick kids are involved - and there will be a next time. If you both just anticipate and gear up for conflict when this happens again, it could make things worse. I hope your daughter is feeling better.