AN MD80 FLT ATTENDANT RPTED THAT AN ODOR WAS SO STRONG DURING A FLT FROM CLT TO DFW; THAT THE CAPT DROPPED THE OXYGEN MASKS AND DIVERTED TO BNA.

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APPROX 25 MINS INTO FLT; A STRONG ODOR BECAME EVIDENT THROUGHOUT ACFT. I TOLD FLT ATTENDANT #4 THAT IT SMELLED LIKE HORSE MANURE/FERTILIZER/PESTICIDE. ONCE IT WAS VERIFIED THAT MAIN CABIN HAD JUST AS STRONG OF AN ODOR; FLT ATTENDANT #4 CALLED CAPT TO RPT. WE WERE INFORMED THAT WE WOULD BE DSNDING TO UNDER 10000 FT TO RELEASE THE CABIN AIR AND TO PUT ALL SVC CARTS AWAY AND STOWED. I CALLED THE CAPT TO RPT THAT THE ODOR WAS GONE AND HE TOLD ME THAT WE WERE NOW GOING BACK UP TO CRUISING ALT. WHILE STILL ON INTERPHONE; I RPTED THAT CABIN WAS EXPERIENCING EXTREME HEAT AND AT THAT VERY MOMENT THE ODOR WAS BACK; BUT MUCH STRONGER. INSTANT REACTION TO THROAT; NOSE; MOUTH. I INSTANTLY GOT A HEADACHE AS WELL. EYES WERE IRRITATED AND BEGAN TO WATER. THE MASKS DROPPED AND PAX WERE INSTRUCTED TO USE OXYGEN. THE CAPT TOLD ME THAT WE WERE DIVERTING TO NASHVILLE. NO TIME TO BEGIN PLANNED EMER CHKLIST. DEPLANED IN NORMAL FASHION. ALL 3 FLT ATTENDANTS WENT TO HOSPITAL; RELEASED AFTER TREATMENT AND OBSERVATION.