AC114 PLT ARRIVING FOR APCH ENCOUNTERED WX AND LIGHTNING WHICH CONTRIBUTED TO BECOMING DISORIENTED. RPTR BECAME CONFUSED WHEN COMMENCING THE APCH AND DSNDED BELOW THE GS WHEN APCH CTLR ALERTED HIM OF ALT.

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I DID NOT EXPECT TO BE TURNED TO INTERCEPT THE LOC SO SOON. I DID HAVE THE NDB TUNED IN; HAD ATIS INFO; AND THE APCH PLATE ALL SET; BUT OVERLOAD FACTORS WERE BUILDING: 1) I WAS RATTLED BY THE FLT CONDITIONS OF LIGHTNING; HVY RAIN; SLEET; AND TURB. 2) THE PLANE WAS STILL AT CRUISE OF 140 KTS AND NEEDED TO BE SLOWED TO 90 KTS. THE AIRSPD INDICATOR READ 160 KTS WHICH SUGGESTED THAT I HAD PICKED UP ICING (POSSIBLY SLEET) IN THE PITOT TUBE. PITOT HEAT WAS ON. 3) I STARTED TO SLOW THE PLANE DOWN AFTER I WAS TURNED TO '330 DEGS AND CLRED FOR THE ILS RWY 28 APCH.' 4) I SWITCHED THE VOR FREQ FROM SYR VOR 117.0 TO THE ILS RWY 28 FREQ OF 109.9; IDENTED IT; SWITCHED RNAV OFF; AND TWISTED IN THE ILS INBOUND HDG OF 279 DEGS. 5) I INTERCEPTED THE LOC ALMOST IMMEDIATELY WITH THE GEAR STILL UP AND THE PLANE SLOWING DOWN TO THE APCH SPD OF 90 KTS. 6) I SLIGHTLY OVERSHOT THE INTERCEPT TO THE LOC BEFORE TURNING AND TRACKING INBOUND. 7) THE WIND WAS ABOUT 220 DEGS AT 33 KTS. THAT ADDED TO MY HIGHER THAN NORMAL GND SPD MOVING ME PAST THE INTERCEPT INTXN TO THE LOC. 8) I DID NOT PICK UP THE DME OFF OF THE ILS LOC. I; THEREFORE; DID NOT HAVE DME DISTANCE INFO TO THE ARPT OR THE OM KIRKI. 9) WHILE I WAS ABOUT 15+ MI FROM THE ARPT; I WAS POSITIONALLY DISORIENTED BY MY 20 DEG TURN TO THE L TO AVOID LIGHTNING; DEMANDS OF FLYING IN BAD WX; RAPID FIRE ACTION ITEMS PREPARING FOR THE APCH; LOSS OF DME INFO. I WAS CONFUSED ENOUGH TO THINK I WAS POSSIBLY INSIDE THE OM AND HAD TO FOLLOW THE GS DOWN BELOW 1800 FT.