FO FALLS ILL DURING FLT TO DFW FROM YVR. FLT WAS 45 MINS FROM DFW AND RECEIVED PRIORITY HANDLING FROM ATC TO LAND AT DFW. FO FOUND TO HAVE HAD A GALL BLADDER ATTACK AND REQUIRED SURGERY AT HOSPITAL. AN AIRBUS QUALIFIED FO WAS ON BOARD TO SUPPLEMENT THE CREW AND ASSIST IN THE FLT HANDLING.

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THE FO EXPERIENCED NAUSEA AND GASTROINTESTINAL PAIN DURING FLT. PAIN BEGAN DURING LUNCH ONBOARD ACFT AND INTENSIFIED AFTER EATING. WITHIN 30 MINS BECAME VERY UNSETTLED AND STARTED VOMITING. CONTINUED VOMITING OVER NEXT 45 MINS AND HAD TO STAND UP TO STAY LUCID. I TOLD CAPT I COULD NOT PERFORM SATISFACTORILY IN THE FO SEAT. CAPT ASKED ANOTHER PLT; AIRBUS QUALIFIED; TO COME FORWARD TO ASSIST. A DOCTOR WAS FOUND ONBOARD; PREVIOUS FLT SURGEON; WHO ASSISTED FO AS BEST HE COULD WITH NO DIAGNOSTIC TOOLS. FO ADVISED CAPT THAT CONTINUED ROUTING TO DFW WOULD BE OK WITH NO INTERMEDIATE LNDG REQUESTED FOR THE PAIN. CAPT REQUESTED PRIORITY HANDLING AND IT WAS GRANTED. FO ASSISTED AIRBUS PLT AND CAPT WITH FLT PROCS. FLT GIVEN CLRNC TO LAND ON RWY 35L DFW. FO LEFT ACFT IMMEDIATELY AND WAS MET BY ARPT POLICE. EMER MEDICAL SVCS WERE PROVIDED AT ARPT AND ENRTE TO HEALTH CARE FACILITY WHERE FO WAS TAKEN FOR TREATMENT. FO ADMITTED TO HOSPITAL AFTER DIAGNOSIS FROM PHYSICIAN. GALL BLADDER SURGERY PERFORMED WITHIN 24 HRS. SUPPLEMENTAL INFO FROM ACN 376280: DURING MY FLT FROM YVR TO DFW ON AUG/XA/97 ABOUT 45 MINS FROM LNDG AT DFW; MY FO SAID THAT HE WAS EXPERIENCING BAD GAS PAINS IN HIS LOWER STOMACH AND THAT HE NEEDED TO STAND UP TO TRY TO RELIEVE THESE PAINS. SHORTLY AFTER HE STOOD UP HE BECAME ILL AND BEGAN TO VOMIT. THE PARAMEDICS WERE STANDING BY AT THE JET BRIDGE AND MY FO WAS TAKEN FROM THE ACFT TO THE ARPT MEDICAL FACILITIES. I CALLED DISPATCH AFTER THE PAX DEPLANED TO DEBRIEF THEM ON ALL THE DETAILS OF THE FLT.