BE33 PLT WITH PASSENGER IN PHYSIOLOGICAL DISTRESS DIVERTS ABRUPTLY INTO UNCONTROLLED ARPT AND CUTS OFF BE90 ON LONG FINAL.

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I WAS FLYING WITH MY FRIEND WHEN HE DEVELOPED AN URGENT NEED TO URINATE. (HE HAS A HEART CONDITION AND TAKES DIURETICS; WHICH SOMETIMES RESULT IN A NEED TO URINATE WITH GREAT URGENCY AND LITTLE WARNING.) WE WERE CLOSE TO JWY. WE LOOKED FOR OTHER ACFT AND; SEEING NONE; I LANDED QUICKLY ON RWY 34; WHICH WAS FAVORED BY THE CURRENT WIND DIRECTION. I TOUCHED DOWN AND WAS ABOUT TO TURN OFF TO THE PARKING RAMP WHEN I SAW A KING AIR MAKING A GAR. AFTER PARKING ON THE RAMP; MY OLD FRIEND APOLOGIZED TO THE KING AIR PLT; EXPLAINING THAT WE DID NOT SEE HIM ON LONG FINAL APCH. HE REPLIED 'OK; NO PROB.' I REALIZE THAT THIS WAS AN ERROR ON MY PART AND COULD HAVE HAD SERIOUS RESULTS. IF I HAD SEEN THE KING AIR I WOULD NOT HAVE CUT HIM OFF AND WOULD HAVE FOLLOWED HIM IN TO LAND. I SHOULD HAVE CALLED IN ON THE CTAF EVEN WHEN I HAD VISUALLY SCANNED THE AREA AND HAD SEEN NO TFC. THE URGENCY OF MY FRIEND'S DISTRESS HAD PREVENTED ME FROM TAKING TIME TO FIND THE CTAF TO ANNOUNCE MYSELF. IN THE FUTURE I WILL NEVER LAND AT EVEN A REMOTE ARPT WITHOUT ANNOUNCING MY PRESENCE AND CHKING FOR OTHER TFC ON THE CTAF AND I WILL NOT LET A PAX'S DISCOMFORT PREVENT ME FROM FLYING SAFELY; LOOKING AND LISTENING FOR OTHER TFC.