He seems happy as far as we can tell. He has seen you recently. I had chest pains with panic attacks, i was convinced it was a heart attack, couldn't breathe, pins and needles in hands. I did go to a&e (bit embarrassing now, but i didn't know).
See your doctor at some point, anyway, because at the very least, they can treat your anxiety and one more check-up may reassure you.
Meanwhile, it sounds as though you've successfully treated the panic attack, so keep the bag around in case. I knew i was better when i threw mine away.
I obviously can't reassure you on physical health, only your doctor can do that - but if that has helped at all- it is purely anxiety.
very best wishes xx