SOME ALT HDG TRACK DEVS AS NEW HIRE FO TAKES OVER ACFT CTL AFTER CAPT BECOMES INCAPACITATED. FLC BEHAVIOR ILLNESS INCAPACITATION.

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WHILE IN CRUISE AT FL330; THE CAPT INDICATED THAT HE WASN'T FEELING WELL. WHEN I ASKED IF HE THOUGHT HE WAS GOING TO BE OK; HE SAID HE WASN'T SURE. AT THAT TIME; HE HAD WHAT APPEARED TO BE A SEIZURE. IN THE PROCESS; THE CAPT INADVERTENTLY KNOCKED OFF THE AUTOPLT. I ASSUMED THE CTLS; IN THE PROCESS; HOWEVER; WE LOST APPROX 500 FT. I RE-ESTABLISHED THE ACFT ON ALT AND PRESSED ALT HOLD. I FAILED TO TURN THE AUTOPLT ON AND WE DSNDED AGAIN. I RE- ESTABLISHED BACK ON ALT; TURNED ON THE AUTOPLT; AND NOTIFIED ATC THAT WE'RE EXPERIENCING INFLT DIFFICULTIES. THE CAPT CAME TO AND I ASKED IF HE WANTED TO DEVIATE. HE SAID; 'YES; PITTSBURGH.' I NOTIFIED ATC AND WAS GIVEN DSCNT INSTRUCTIONS AND A VECTOR TO PIT. DURING THE DSCNT; THE #1 FLT ATTENDANT ASSISTED IN FASTENING THE CAPT'S SHOULDER STRAPS AND APPLYING HIS OXYGEN MASK. I COMPLETED THE DSCNT CHKLIST EARLY; SET UP MY LNDG DATA; NOTIFIED COMPANY OPS AND COMPLETED THE MECHANICAL CHKLIST BY 1400 FT AGL. PIT APCH GAVE ME RADAR VECTORS TO FINAL TO RWY 10L. I OVERSHOT THE CTRLINE BY ABOUT 1 NM; BUT WAS ABLE TO RECOVER AND LAND UNEVENTFULLY. AT THE COMPLETION OF THE ROLLOUT; THE CAPT WAS CONSCIOUS ENOUGH TO STEER THE ACFT ON TO THE PARALLEL TXWY AT THE DEP END OF THE RWY. I SHUT DOWN THE ACFT AS THE CRASH CREW ARRIVED AND THE CAPT WAS REMOVED VIA THE AFT AIRSTAIR. WE WERE TOWED TO THE GATE AND THE PAX WERE DEPLANED. IT WAS DETERMINED THAT THE CAPT HAD A SUDDEN ONSET OF FOOD POISONING DUE TO HIS WIFE'S HOME COOKING.