CJ, I agree it is scarey a thing to go through. Ten minutes is a long time to fight for air in a choking/coughing fit. It will wear a body down fast!
My heart goes out to the both of you. If your husband is feeling up to it, I think he should go fishing with your dad. I believe you are correct in thinking that a trip to the hospital to see his friend would probably bring on added anxiety.
Zaphoon