A C152 PLT; WHILE CRUISING AT 5500 FT; BECAME ILL. UNABLE TO FLY THE ACFT HE ELECTED TO LAND IN A NEARBY FIELD.

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WHILE TRACKING TO THE NAVASOTA VOR (APPROX 15 NM SW) AT AN ALT OF 5700 FT MSL; I NOTICED BRENHAM (11R) ARPT OFF OF MY L WING. SOON AFTER THIS POINT; I BECAME DIZZY; DISORIENTED; AND UNABLE TO HOLD AN ALT OR HDG. I IMMEDIATELY OPENED A WINDOW AND STARTED A DSCNT; WHILE ALSO MAKING A TURN TO THE L TO RELOCATE 11R ARPT. AFTER DSNDING TO APPROX 1000 FT MSL AND NOT BEING ABLE TO LOCATE 11R ARPT; I DIALED IN THE COLLEGE STATION VOR AND STARTED TRACKING INBOUND ON THE 330 DEG RADIAL. MY CONDITION CONTINUED TO DETERIORATE AND SIMPLE TASKS BECAME VERY DIFFICULT TO PERFORM. I WAS EXPERIENCING TUNNEL VISION AND A LOSS OF ABILITY TO JUDGE TIME AND DISTANCE. I MADE A RADIO CALL TO EASTERWOOD TWR REQUESTING TO LAND. HOWEVER; I WAS MUCH FARTHER FROM THE ARPT THAN I THOUGHT. AFTER REALIZING THIS; AND FEELING LIKE I WAS CLOSE TO PASSING OUT; I DECIDED THAT I HAD TO LAND THE PLANE ASAP. I FOUND THE FIRST SUITABLE FIELD; MADE SURE THAT THE PLANE WAS HEADING INTO THE WIND; AND LANDED THE AIRPLANE SAFELY. NO DAMAGE WAS SUSTAINED TO MYSELF OR THE ACFT. MY HEALTH HAS ALWAYS BEEN GOOD; AND I FELT VERY GOOD PHYSICALLY BEFORE THE FLT AND DURING THE FLT UNTIL THE INCIDENT OCCURRED. THE WX CONDITIONS WERE EXCELLENT AND WERE NOT A FACTOR IN THE INCIDENT. LOOKING BACK; I CAN'T THINK OF ANYTHING THAT I WOULD HAVE DONE DIFFERENTLY. IT WAS THE CORRECT DECISION TO LAND THE PLANE WHEN I DID; OTHERWISE THE RESULTS WOULD HAVE BEEN MUCH WORSE. THE SYMPTOMS THAT I SUFFERED FROM WERE CONSISTENT WITH CARBON MONOXIDE POISONING; BUT THE EXACT CAUSE HAS YET TO BE DETERMINED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT AFTER THE INCIDENT HE WAS EXAMINED BY HIS DOCTOR WHICH INCLUDED BLOOD WORK AND THE RESULT WAS NEGATIVE. ALTHOUGH HE FELT SOMEWHAT UNDER THE WX FOR A COUPLE OF WKS FOLLOWING THE INCIDENT; HE IS FEELING FINE NOW AND IS BACK TO FLYING WITH NO RESTRS. THE ACFT ALSO HAS A CLEAN BILL OF HEALTH.