Mother’s warning as boy, 10, suddenly falls ill with potentially-fatal condition after swimming at New Hampshire beach

A New Hampshire mother is sounding the alarm after her 10-year-old son suffered hypothermia while on a trip to the beach. 

Declan Cassani, 10, said he ‘saw black’ moments before he threw up and passed out on Hampton Beach on the Fourth of July. 

His mother Heather told WMUR that he was…