Oh, Quish, I'm so sorry to hear this.....I'm glad you were able to get an ambulance there and get him to the hospital!
Right now......breathe.....and breathe again.
He is in good and capable hands of medical caregivers. Allow yourself to unwind--just a bit.
I don't know that any of us can tell you what the future holds--but just for today, try to relax a bit knowing your husband is where he needs to be to receive appropriate care.