B747-400 CABIN CREW RPT STRONG ODORS AND SYMPTOMS OF CARBON MONOXIDE POISONING DURING PREFLT.

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DURING CREW BOARDING I CAN SMELL A VERY STRONG UNPLEASANT ODOR BOTH IN THE JETWAY AND THE ACFT. FLT ATTENDANT X THOUGHT THE ACFT MUST HAVE BEEN SPRAYED. I PERFORM MY PREFLT DUTIES AS USUAL AND VERY SOON START FEELING A SHORTNESS OF BREATH AND NAUSEA. I TOLD FLT ATTENDANT Y THAT I CAN FEEL AN ASTHMA ATTACK COMING. I USED MY INHALER AND TOOK AN ALLERGY TABLET. MEANWHILE FLT ATTENDANTS IN CABIN START DEVELOPING SYMPTOMS SUCH AS IRRITATION IN THE EYES; ITCHINESS ON THE LIMBS AND HEADACHE. I HAVE THE SAME SYMPTOMS PLUS SKIN RASHES ON MY NECK; CHEST AND LIMBS. PURSER X CAME TO CHK ON THE CREW AND DECIDED TO REPORT TO CREW CTL AND WHEN IGNORED REQUESTED A SUPVR COME ONBOARD. WE WERE BRIEFED BY THE CAPT THAT THERE WAS A FUEL LEAK FROM THE APU AND HE SUSPECTED OUR SYMPTOMS TO BE CARBON MONOXIDE POISONING. HE DECIDED TO HAVE ALL THE CREWS VACATE THE ACFT FOR 20 MINS AND CRACK THE DOORS TO AIR OUT THE AIRPLANE. WE WENT TO THE BOARDING AREA FOR SOME FRESH AIR. MEANWHILE CAPT DECIDED TO CHANGE EQUIP AND THE FLT WAS DELAYED. I WORKED THE FLT BUT STILL EXPERIENCED SORE THROAT; HEADACHE; RESPIRATORY AND SKIN ALLERGIES THROUGHOUT THE FLT. I HAVE TO TAKE MAXIMUM DOSAGE OF ALLERGY MEDICATION. AFTER THE FLT MY SORE THROAT AND SKIN RASHES PERSIST UNTIL TODAY.