CAPT OF A SUPER MD80 BECAME ILL DURING FLT AND ARRANGED WITH FO TO FLY THE ACFT WITH HIM DOING THE FO DUTIES.

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DURING FLT; I BECAME ILL WITH NAUSEA; VOMITING; AND HOT AND COLD SWEATS. I WOKE UP AT XA00 FOR MY TRIP WITH A SLIGHT HEADACHE IN THE AREA OF THE SINUSES. THE HEADACHE BECAME STEADILY WORSE THROUGHOUT THE MORNING DURING SIGN-IN; DEP; AND THE CLB TO CRUISE ALT. APPROX 1 HR AFTER DEP; I STARTED TO FEEL HOT AND NAUSEOUS. AT THIS TIME I CALLED THE #1 FLT ATTENDANT TO THE COCKPIT AND EXPLAINED TO HER AND THE FO THAT I WAS FEELING SICK TO MY STOMACH AND SUFFERING FROM A HEADACHE. I STATED MY INTENTION TO CONTINUE TO DEST AND IF NOT FEELING BETTER SOON TO INFORM DISPATCH SO THAT I COULD BE REMOVED FROM THE BAL OF THE SEQUENCE ON ARR AT DFW. THE #1 FLT ATTENDANT ACKNOWLEDGED THAT I LOOKED 'AWFUL' AND PROCEEDED TO BRING ME COLD WASH CLOTHS; A PILLOW; ETC. I TURNED OVER THE PF DUTIES TO THE FO; WHO FROM THIS POINT UNTIL IN CONTACT WITH APCH CTL CTLED THE ACFT AND TALKED ON THE RADIO. I ASKED THE #1 FLT ATTENDANT IF WE HAD ANY DEADHEADING PLTS ON BOARD AND TO DISCREETLY INQUIRE ON THE NON REVENUES IF ANY OF THEM WERE COCKPIT CREW MEMBERS AND IF SO; WHAT EQUIP AND POS THEY WERE QUALIFIED IN. THE #1 FLT ATTENDANT RETURNED TO RPT THAT THERE WERE NO DEADHEADING OR NON REVENUING COCKPIT CREW MEMBERS ON BOARD. I EXPLAINED TO THE FO THAT I FELT IN MY PRESENT CONDITION; AND CONSIDERING THE DEST WX; THAT IT WAS AT LEAST AS SAFE TO CONTINUE TO DFW AS TO DIVERT TO A STATION ALONG THE RTE. I FELT THAT WITH HIS RELATIVELY LIMITED EXPERIENCE (APPROX 500 HRS IN TYPE) THAT HE PROBABLY WOULD BE MORE COMFORTABLE AT A STATION HE WAS FAMILIAR WITH; AND I DIDN'T FEEL MY PHYSICAL CONDITION WAS IN ANY WAY CRITICAL. WE DISCUSSED THE FACT THAT I WOULD HAVE TO TAXI THE AIRPLANE AFTER LNDG AND BRIEFLY CONSIDERED THE POSSIBILITY OF HAVING THE AIRPLANE TOWED IF NECESSARY. WE DECIDED IN MY PRESENT STATE THAT I COULD TAXI THE ACFT SAFELY; HOWEVER; WE WOULD IF NECESSARY REQUEST FROM ATC A RWY WITH A SHORT TAXI TO THE TERMINAL IF SO NEEDED ON ARR. ABOUT THIS TIME (APPROX 1 HR FROM DEST) I WENT BACK TO THE FIRST CLASS LAVATORY AND VOMITED. I RETURNED TO THE COCKPIT AND DISCUSSED THE STAR WITH THE FO; DISCUSSING APPROPRIATE XING ALTS AND AIRSPDS. NEXT; I INFORMED DISPATCH OF THE SIT VIA VOICE RADIO AND REQUESTED THAT I BE REMOVED FROM THE SEQUENCE UPON ARR AT DFW. I BEGAN TO FEEL BETTER AS WE BEGAN THE DSCNT AND I ASSUMED ALL THE PNF DUTIES BY THE TIME WE CONTACTED REGIONAL APCH. WE WERE GIVEN RWY 35R; WHICH WE ACCEPTED; AS AT THIS POINT I WAS BEGINNING TO FEEL MUCH BETTER AND WERE CERTAIN A SHORT TAXI WOULDN'T BE REQUIRED. THE FO FLEW A VERY NICE ILS APCH IN VMC TO A TEXTBOOK TOUCHDOWN AND ROLLOUT. I TOOK OVER CTL OF THE AIRPLANE ON ROLLOUT; EXITED THE RWY AND TAXIED TO THE GATE. THIS PROBATIONARY FO; WHILE NEW TO ACR; IS A RETIRED MIL PLT WHOSE EXPERIENCE AND STRONG SITUATIONAL AWARENESS SHOWED THROUGHOUT THE FLT. HE DID AN EXCELLENT JOB OF TAKING UP THE SLACK FOR A SICK CAPT. HE BALANCED THE PNF AND PF DUTIES NICELY. THE #1 FLT ATTENDANT WAS BOTH KIND AND CONCERNED. SHE WAS HIGHLY PROFESSIONAL -- RESPONDING IMMEDIATELY AND CHANGING HER PRIORITIES TO ASSIST THE COCKPIT WHEN CAUGHT IN THE MIDST OF HER CABIN SVC. ALL IN ALL; THE CREW WORKED VERY WELL TOGETHER. CLR COM; DISCUSSION OF OPTIONS; DEVELOPMENT OF CONCISE PLAN WENT A LONG WAY TOWARDS KEEPING A BAD SIT FROM BECOMING FAR WORSE. I WAS HIGHLY PLEASED WITH THE PERFORMANCE OF THIS CREW.