As it turned out, my son was suffering from dyhydration as this woman had told us. it was reassuring those people who responded to our need for help. After a morning getting medical attention,we were able to enjoy the afternoon in Key WEst.
Incidentally, Customs did come down to the infirmary as there was a "full house".
The response from these fellow passengers as well as the medical facility reassured us in our moment of panic.
That said, we encourage all to purchase the travel insurance and stay well hydrated.
we had purchased the Coke pass but after this, my son carried bottled water with him EVERYWHERE!!
Thanks again to these kind shipmates!!