Nate Bain says his family is absolutely STUNNED at the $150,000 in donations he's received since Stephen F. Austin State upset Duke ... and he's telling us how the money will be spent.
Of course, Bain's story went viral after the Duke game -- his family home and church in the Bahamas were destroyed in Hurricane Dorian -- and people raced to his GoFundMe to help them rebuild.
The good news ... Bain tells TMZ Sports his family home is covered by insurance, so the GoFundMe cash (currently around $150k) will be used to help the scores of people who need help the most.