PVT PLT OF A MOONEY MD20C LANDED GEAR UP. PLT HAD BEEN UNINTENTIONALLY FLYING GEAR DOWN; MOVED GEAR LEVER TO OPPOSITE DIRECTION; THUS RAISING GEAR.

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I LANDED WITH THE GEAR UP. HERE ARE SOME FACTORS THAT CONTRIBUTED TO THE INCIDENT. I HAVE BEEN FLYING A COMPLEX AIRPLANE FOR ONLY 4 MONTHS WITH ONLY A FEW HRS AT NIGHT. I FAILED TO RECOGNIZE MY FATIGUE AFTER A LONG DAY OF BEING AT A MEETING. WHEN DEPARTING FROM THE ARPT; A WX SYS WAS ONLY A FEW MI AWAY; AND I FAILED TO USE MY CHKLIST ON TKOF. DISTR BY THE STORM; I FAILED TO RETRACT THE GEAR. THE RESULTING POOR PERFORMANCE OF THE AIRPLANE WAS A CONTINUING CONCERN AND I ATTRIBUTED THIS TO A HEADWIND. IN DIVERTING AROUND THE WX SYS I MISTOOK ONE CITY FOR ANOTHER AND WAS THEN CONFUSED ABOUT MY LOCATION. A NEW SIGMET WAS ANNOUNCED AND I DECIDED TO MAKE A PRECAUTIONARY LNDG TO SORT OUT MY CONFUSION. AS I PREPARED FOR THE LNDG; I MOVED THE GEAR LEVER FROM ITS PRESENT POS TO THE OPPOSITE; WHICH RAISED THE GEAR INSTEAD OF LOWERING IT. THE AIRPLANE DIDN'T FEEL RIGHT; AND THE GEAR WARNING HORN WAS SOUNDING WHEN I REDUCED THE THROTTLE. DUE TO MY FATIGUE I WAS UNABLE TO FIGURE OUT WHAT WAS WRONG AND I ENTERED SOME TURB JUST ABOVE PATTERN ALT. I CONTINUED THE APCH IN SPITE OF KNOWING THAT SOMETHING WAS SERIOUSLY WRONG BUT UNABLE TO DETERMINE THE CAUSE. ACTIONS THAT MIGHT HAVE BEEN TAKEN INCLUDE RETURNING TO A SAFE ALT AND CYCLING THE GEAR; GOING THROUGH THE CHKLIST; CALLING APCH CTL AND TALK THROUGH THE PROB WITH THEM.