MY HUSBAND S NAILS HAVE THICKENED ,HAVE RIDGES,TURNED DARK AND ARE SEPERATING FROM THE NAIL BEDS. HE HAS HAD COPD FOR FIVE YRS.,IS TAKING PREDNISONE,HAD A MASSIVE HEARTATAC IN 2014, AND HASN T SMOKED IN OVER 20 YRS. hIS NAILS HURT . iS THERE A CURE FOR THEM? hE HAS TRIED ANTIFUNGAL MEDICATIONS.