J3 PLT BECAME ILL; TO THE POINT HE THOUGHT HE WOULD PASS OUT. PLT LANDED ON A CLOSED RWY.

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WHILE ENRTE N57 TO N30; I BECAME SEVERELY ILL IN THE VICINITY OF MPO; TO THE EXTENT THAT I THOUGHT I MIGHT PASS OUT. WHETHER THIS WAS DUE TO AIRSICKNESS OR A 'BUG;' I AM NOT SURE; BUT I FELT IT UNWISE TO CONTINUE AND DECIDED TO LAND AT MPO. SURFACE WINDS THERE WERE 350 DEGS; GUSTING TO AT LEAST 20 KTS; GIVING A 60 DEG XWIND FOR THE ACTIVE. (THE FIELD IS UNCTLED.) I ATTEMPTED TO LAND; BUT IT BECAME OBVIOUS THAT ANY LNDG ON THIS RWY WOULD RESULT IN DAMAGE. RWY 31 WAS MORE NEARLY INTO THE WIND BUT WAS X'ED AND HAD TFC CONES AT THE INTXN; DUE TO CONSTRUCTION AT THE N END. THERE WAS 1200-1500 FT AVAILABLE ON THE S END -- AMPLE FOR THIS TYPE OF ACFT; SO I LANDED ON IT WITH NO DIFFICULTY. I FELT IT WOULD BE HAZARDOUS TO HAVE CONTINUED ON TO ANOTHER ARPT AND THAT I WAS DEALING WITH AN INFLT EMER. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: PLT WAS FLYING A PIPER J3 CUB ACFT. HE STARTED TO FEEL SICK ENRTE. THE PLT STAYED FOR 4 DAYS AND THEN TOOK SURFACE TRANSPORTATION HOME. HE PICKED THE ACFT UP THE NEXT WKEND; AFTER HE FELT BETTER.