HARD LNDG IN E-120 GOES UNRPTED IN A NIGHT OP.

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I HAVE BEEN WITH MY AIRLINE FOR ALMOST 5 YRS AND DURING THIS PERIOD I HAVE BEEN EXTREMELY PLEASED WITH THE COCKPIT RESOURCE MGMNT TRAINING I HAVE RECEIVED. I HAVE TRIED TO INCORPORATE SUCH LESSONS INTO MY BRIEFINGS TO MY CREW PRIOR TO FLT AND CONSIDER MYSELF A VERY APCHABLE CAPT. EVEN SO; THE OTHER NIGHT I EXPERIENCED A TOTAL BREAKDOWN OF COM WITH MY CREW BOTH IN THE COCKPIT AND IN THE CABIN. DURING A LOW VISIBILITY APCH INTO DAY; MY FO APPARENTLY BECAME DISORIENTED AFTER BREAKING OUT OF THE CLOUDS AND ASSUMING VISUAL CTL OF THE ACFT FOR LNDG. HOWEVER; HE NEVER SAID A WORD ABOUT IT UNTIL AFTER WE HAD MADE A RATHER FIRM LNDG. WHILE I WAS TAXIING TO THE GATE HE STARTED TALKING ABOUT VERTIGO. I WAS ASTOUNDED THAT HE HAD NOT MENTIONED THE PROB SO THAT I COULD RENDER ASSISTANCE. INSTEAD; HE STAYED QUIET AND TOOK A CHANCE THAT COULD HAVE RESULTED IN MUCH WORSE CONCLUSIONS THAN A HARD LNDG. AFTER SHUTTING DOWN AT THE GATE AND DEPLANING; I WENT AND PRINTED CURRENT WX FOR THE RETURN TRIP TO CVG AND INSPECTED THE EXTERIOR OF THE AIRPLANE. FINDING EVERYTHING OK; I RE-ENTERED THE AIRPLANE AND BRIEFED THE FLT ATTENDANT ON THE CURRENT WX IN CVG. DURING THE BRIEF SHE SEEMED FINE AND NEVER MENTIONED ANY PROBS. THE PAX WERE BOARDED AND WE RETURNED TO CVG WITHOUT FURTHER INCIDENT. WHEN THE FLT ATTENDANT GOT OFF THE AIRPLANE SHE SAID SHE WAS SUFFERING FROM A HEADACHE BECAUSE SHE HAD HIT HER HEAD AGAINST THE BULKHEAD DURING THE LNDG AT DAYTON. WHEN I ASKED WHY SHE HAD SAID NOTHING IN DAYTON; SHE REPLIED THAT SHE WAS IN A HURRY TO GET HOME. SO TWICE IN 1 NIGHT MY CREW WITHHELD INFO I NEEDED TO DO MY JOB; FOR NO GOOD REASON.