A BONANZA PLT ELECTED TO CONTINUE AN APCH HE LATER FELT HE SHOULD NOT HAVE.

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THE WX BRIEFER SAID THAT MY RTE HOME WAS STILL MOSTLY LEVEL 1 AND LEVEL 2 BUT THAT A STORM CELL WAS BEARING DOWN ON RFD FROM THE SW AND ONLY 12 MI AWAY. HE RECOMMENDED I LEAVE ASAP -- WHICH I DID. ABOUT 25 MI OUT; APCH CTL PUT ME ON A 090 DEG HDG WHICH EVENTUALLY PUT ME ON A LINE THAT TOOK ME JUST N OF THE ARPT AND S OF THE OM AT 4000 FT. ABOUT 10 MI OUT I RETUNED THE ATIS AND DISCOVERED THAT THE CEILING WAS NOW 300 FT BROKEN; 700 FT OVCST WITH THE WIND AT 010 DEGS AND 15 KTS AND VISIBILITY DOWN TO 3 MI. AT ABOUT THE TIME I WAS ABREAST OF WISIL I SET UP THE ILS AND CHANGED THE GPS RANGE TO 5 MI ANTICIPATING A L TURN AND DSCNT TO 3000 FT. SURE ENOUGH; A MIN LATER IT WAS 'TURN TO A HDG OF 250 DEGS; DSND TO 3000 FT MAINTAIN 3000 FT UNTIL ESTABLISHED ON THE ILS; CLRED FOR THE APCH.' I FLIPPED THE HDG BUG TO 250 DEGS AND JUST STARTED TO CHANGE THE ALT HOLD WHEN I THOUGHT I HIT A BUS. EVERYTHING FLEW UP TO THE CEILING AND I HIT MY HEAD HARD ENOUGH TO COMPLETELY KNOCK OFF MY HEADSET. WHEN I GOT MY SCAN BACK ON THE INSTS I SAW THAT I WAS DSNDING AT ABOUT 500 FPM AND HDG 190 DEGS! THE JOLT HAD DISCONNECTED THE AUTOPLT AND IN JUST THOSE FEW SECONDS HAD ME TURNED ALMOST 270 DEGS! I GOT THE WINGS LEVEL; TURNED BACK TO 250 DEGS AND PUNCHED IN THE AUTOPLT. WHEN I GOT DOWN TO 3000 FT I HAD ALREADY PASSED WISIL AND THE STRONG N WIND WAS PUSHING ME PARALLEL TO THE LOC. IT WAS CLR THAT I WAS NEVER GOING TO GET ESTABLISHED AND DOWN TO THE INTERCEPT ALT OF 1900 FT BY THE LOM. AT THIS POINT A SUPVR CAME ON THE FREQ AND TOLD ME THAT THEY WERE GOING TO HAVE TO VECTOR ME AROUND FOR ANOTHER APCH. I COULD SEE FROM THE GPS WHERE I WAS RELATIVE TO THE LOC AND I HAD NO FOND FEELING ABOUT GOING BACK OUT OVER THE LAKE. I TOLD HIM TO GET ME DOWN TO 1900 FT -- I WANTED TO COMPLETE THE APCH. HE SAID OK; TURN TO A HDG OF 270 DEGS AND CALL THE TWR PASSING WAUKE. AS I PASSED ABEAM OF WAUKE (STILL HDG 270 DEGS) I CALLED THE TWR AND WAS CLRED TO LAND. AT THIS POINT THE NEEDLE WAS JUST STARTING TO COME OFF THE PEG AND I BEGAN TO SEE HOUSES THROUGH BREAKS IN THE CEILING. AT 1000 FT MSL (300 FT AGL) THERE I WAS ON A L BASE TO RWY 23. I MADE A FEATHER LIGHT TOUCHDOWN IN A LIGHT RAIN AND TAXIED TO MY HANGAR. AS I SAT THERE WITH THE ENG STILL TICKING OVER; I ASKED MYSELF WHETHER OR NOT I SHOULD HAVE DONE WHAT I DID. ON THE PLUS SIDE; IT WAS MY HOME FIELD AND I KNEW THERE WERE NO OBSTRUCTIONS ANYWHERE IN MY PATH. THE GPS KEPT ME APPRISED OF MY POS; I HAD 300 FT AND 3 MI TO HELP STRAIGHTEN OUT THE APCH. ON THE MINUS SIDE; I NEVER WAS ESTABLISHED ON THE LOC OR THE GS. AT THAT POINT THE MINUSES OVERRODE THE PLUSSES AND I VOWED NEVER TO DO IT AGAIN. I SHOULD HAVE ACCEPTED THE MISSED APCH AND ASKED FOR A R DOWNWIND RATHER THAN THE L DOWNWIND I HAD GOTTEN. IT MIGHT HAVE KEPT ME AWAY FROM THE CELL I WAS VECTORED INTO. I ALSO SHOULD HAVE ASKED FOR 3000 FT SOONER SINCE I COULD SEE THAT THE CTLR WAS BRINGING ME IN TOO TIGHT FOR THE WIND DIRECTION. THE MISSED APCH WOULD HAVE ALSO GIVEN ME A LITTLE MORE TIME TO COLLECT MYSELF AFTER THE JOLT I RECEIVED AND THE MOMENTARY DEV FROM THE APCH I HAD SO CAREFULLY AND CONFIDENTLY FIXED IN MY MIND.