A B737-700 FO RPTED THAT FOOD POISONING CAUSED HER TO BE SO INCAPACITATED THAT THE CAPT HAD TO HANDLE A DIVERSION TO ABQ ALONE.

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SECOND DAY OF 3 DAY PM PAIRING. MIDDAY I (FO) ATE A TUNA SANDWICH FROM KIOSK IN BNA. COMPLETED FLT DAY WITHOUT MUCH CONSEQUENCE; EXCEPT FOR SLIGHTLY 'RUMBLY' STOMACH. REMAIN OVERNIGHT AT HOTEL AND WAS UP A FEW TIMES DURING THE NIGHT WITH DIARRHEA AND VOMITED ONCE. FELT BETTER THE NEXT MORNING AND RPTED TO THE LOBBY. I NOTIFIED CAPT OF FOOD POISONING AND ILLNESS THE NIGHT BEFORE. ALSO; THAT I FELT THE EVENT WAS OVER AND PHYSICALLY FIT TO FLY. NORMAL DUTIES; PREFLT; TKOF AND CLB WERE UNEVENTFUL. DURING CRUISE; I FELT NAUSEOUS AND TOLD THE CAPT I NEEDED TO USE THE RESTROOM. COCKPIT SECURITY PROCS WERE FOLLOWED AND 1 FLT ATTENDANT STAYED IN THE COCKPIT. I FELT LIKE I NEEDED TO VOMIT; GRABBED A SICK SAC AND HEADED FOR THE FORWARD LAVATORY; STOOPED DOWN TO KNEEL OR SIT TO OVERCOME NAUSEA AND BE CLOSE TO 'THE CAN;' EYES CLOSED; AND WAITING TO BE SICK. FLT ATTENDANT CALLED NURSE WHO TOOK PULSE AND ASCERTAINED I WAS OK. I REMAINED IN THE LAVATORY ABOUT 5 MINS. I RETURNED TO THE COCKPIT TO SPEAK WITH THE CAPT TO UPDATE HIM DIRECTLY. CAPT SAID I LOOKED SICK AND ASKED IF IMMEDIATE DIVERT/LNDG WAS NECESSARY; OR IF I WAS ABLE TO CONTINUE TO OKC; TUL (THESE WOULD REQUIRE OVERWT LNDG) OR ABQ? I TOLD HIM I WAS CERTAIN THE FOOD POISONING WAS THE CULPRIT; IT WOULD REQUIRE A REPLACEMENT FO AND THAT ABQ (40 MINS AWAY) WAS A GOOD PLAN. I ASKED TO REMAIN IN THE COCKPIT. HE SAID; 'NO; GO TO THE CABIN AND LAY DOWN.' QUESTIONING 'WHY' I ASKED IF I WOULD 'BE TOO MUCH OF A DISTR IF I WERE SICK IN THE COCKPIT' (VOMIT). HE SAID YES AND ASKED THE FLT ATTENDANT TO REMAIN. I RESTED IN THE BACK OF THE CABIN UNTIL LNDG ABQ WHERE; TO MY SURPRISE; THE ACFT WAS MET BY EMS PERSONNEL. I WALKED THROUGH THE CABIN TO MEET THEM IN THE JETWAY AND RELAYED SYMPTOMS OF LAST NIGHT'S NAUSEA; VOMIT; DIARRHEA AND TIREDNESS; BUT CURRENTLY ONLY EXPERIENCING NAUSEA AND WEAKNESS. BP; PULSE; EKG AND BLOOD SUGAR TESTS TAKEN BY ABQ EMS WERE ALL NORMAL. EMS ADVISED ME THESE SYMPTOMS WERE NORMAL AND WEAKNESS WAS DUE TO DEHYDRATION AND ADVISED TO DRINK WATER. I DECLINED A HOSPITAL TRANSPORT. DEADHEADED HOME WITHOUT FURTHER INCIDENT. CAPT DID AN EXCELLENT JOB OF COORDINATING DISPATCH AND FLT ATTENDANT. HE REPEATEDLY ASKED ME ABOUT DIVERTING AND I REITERATED THAT AN OVERWT LNDG AT AN OFFLINE ARPT WAS NOT NECESSARY. THE FLT ATTENDANTS WERE HELPFUL AND WORKED WELL AS A TEAM. ONE REMAINED IN THE COCKPIT AT ALL TIMES. THE LESSON OBVIOUSLY IS THAT; WHEN IT COMES TO FIT FOR FLT ISSUES; 95% IS NOT 100%. ALTHOUGH I FELT WELL ENOUGH TO FLY BEFORE WE WERE AIRBORNE; I SHOULD HAVE GIVEN MYSELF MORE RECOVERY TIME BEFORE RETURNING TO DUTY.