Hi there Al,
I believe the only cure for panic disorder is ourselves. Medically speaking there is no cure for this. I don't know about the medication side of things, or why it effects people differently. I'm guessing it's a mixture of hormone levels as well as seretonin and dopamine which are two chemicals in the brain I have no idea how to spell. These hormone and chemical levels are never the same from person to person so I guess getting medication right is all about getting the balance right for that person.
So glad to hear you're doing well and able to trust things are going to be ok. Good way to be!
Take care.