I hate this for your family.
Regardless of religion or how devout one might think him/herself, we ARE human and fragile. If your DH is perfect, then he can point fingers and throw his little fit.
Your dtr. needs to be seen, and if he "finds out" then all you can do is be honest with him and confront the issue head on. Her health and safety comes first. It is far more important than his hurt ego over having "failed" at being the "perfect" father... whose children do no wrong.
Do what your heart tells you... you sound like a FINE Mom to me... and I'm glad your children have you to be there for them when they need support.
AFTER the fact is no time to have a temper tantrum... it is the time to reflect, discuss, and offer support......... and UNconditional love. :kiss