EMS HELI FLT WAS DISTR ON APCH TO ZZZ RESULTING IN DSNDING TO 200 FT AGL PRIOR TO OM. CALLING FOR RETURN IFR CLRNC; PLUS DME; DID NOT LOCK ON IMMEDIATELY AND MISSED GS HAD DISENGAGED. WAS TAKING PREDNISONE FOR SINUS PROBS AND HAD BEEN WARNED OF SIDE EFFECTS. HAS BEEN TAKEN OFF FLYING STATUS.

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I WAS DISPATCHED TO FLY TO ZZZ; US; TO PICK UP A PATIENT FOR AN EMS HELI PROGRAM. HAVING BEEN TO THIS LOCATION EARLIER IN THE DAY; I KNEW THAT THE WX WAS MARGINAL VFR SO I RECEIVED A WX RPT; CHKED NOTAMS AND AIR FILED IFR WITH XXX AFB TO ZZZ ARPT. I WAS CLRED TO 4000 FT. LEVELING OFF AT 4000 FT I PROCEEDED TO SET UP FOR THE APCH. ALL THE RADIOS WERE SET; CHARTS WERE REVIEWED FOR THE IMPENDING APCH. THE EXPECTED APCH WAS THE ILS DME; AND NOT BEING AUTH THE DME ILS; I ELECTED TO SHOOT THE LOC APCH. I SET THE RADIO ALTIMETER TO THE LOC MDA PLUS 40 FT. UPON RECEIVING CLRNC FOR THE APCH; I LEFT YYY INTXN ON 185 DEGS; SETTING THE VSI TO 600 FPM DSCNT TO DSND TO THE APCH ALT OF 2300 FT. UPON REACHING ON COURSE INDICATION; I ARMED THE ILS APCH ON THE AUTOPLT AS AN AID AND LEFT 4000 FT FOR THE APCH ALT. AT THIS TIME I RECEIVED A RADIO CALL FROM MY DISPATCH ASKING IF I WERE STILL ON THE RADIO FREQ. I ACKNOWLEDGED THAT I WAS (FIRST DISTR). NEXT; I NOTICED THAT THE DME WAS NOT WORKING AND TUNED IN THE #2 DME. IT WAS WORKING SO I WENT BACK TO THE #1 DME AND IT WAS ALSO ON-LINE AND WORKING (SECOND DISTR). I XCHKED MY INSTS; SAW THAT THE COMMAND BARS WERE CTRED AND I HAD 2 GREEN LIGHTS ON THE HELIPLT CTLR. INCORRECTLY THINKING THAT I WAS ON THE GS; I CONTINUED THE APCH. AT THIS TIME I ALSO CALLED AAA CTR FOR A RETURN IFR TO BE SETUP BACK TO WWW (THIRD DISTR). SOMETHING ON THE APCH JUST DIDN'T FEEL RIGHT AND I RECHKED THE CHARTS AND THE ADI AND HSI AND CONTINUED DOWN. IN FACT; WHAT HAD HAPPENED; WHEN I HAD ARMED THE VERT SPD AND CAPTURED THE LOC; THE GS HAD DEACTIVATED AND THE GS ARM LIGHT HAD WENT OUT. THE MAJOR ERROR AT THIS POINT WAS THAT I DID NOT CONFIRM MY ALT AND GS CAPTURE AND FLYING THROUGH 3 ALT CHKS. ALSO I HAD NOT YET PASSED THE OM. I DSNDED UNTIL THE DECISION HT LIGHT CAME ON 7 MI FROM THE ARPT. KNOWING THAT THIS WASN'T RIGHT I STARTED A CLB; BROKE INTO VMC CONDITIONS; SAW THE GND AND TREES AT GREATER THAN 200 FT. THE REST OF THE FLT WAS UNEVENTFUL. AFTER REVIEWING THE FLT AND HAVING HAD TIME TO TRULY GO BACK; THERE WERE OTHER CIRCUMSTANCES THAT HAD A LARGE BEARING ON THE NEAR DISASTROUS FLT. I HAD JUST BEEN PUT ON MEDICATION (PREDNISONE) FOR SINUS PROBS AND WAS TOLD THAT IT MIGHT MAKE ME A LITTLE NERVOUS. AGAIN; AFTER REFLECTING BACK; I BECAME AWARE THAT I HAD NOT SLEPT THE NIGHT BEFORE. I DID NOT FEEL TIRED AT ALL BUT WAS APPARENTLY MORE UNDER THE INFLUENCE THAN I EVER IMAGINED. I DID NOT SLEEP FOR THE NEXT 3 NIGHTS AND AFTER CONTACTING MY MEDICAL DOCTOR; AND A PSYCHOLOGIST FOR CRISES COUNSELING; I WAS REMOVED FROM THE MEDICATION AS RAPIDLY AND AS SAFELY POSSIBLE. I HAD THE FLU THE 6 DAYS BEFORE RPTING TO WORK AND HAD NOT FULLY RECOVERED FROM THOSE EFFECTS. I HAVE SHOT THAT APCH MANY TIMES AND KNOW IT WELL. WITH ALL THE OTHER DISTRS AND MEDICATION I HAD UNWITTINGLY SET MYSELF UP FOR WHAT COULD HAVE BEEN A DISASTER. I WAS GIVEN A REVIEW FLT THE NEXT MORNING AND WAS ABLE TO FLY ALL THE APCHS BUT WAS EXTREMELY NERVOUS AND DISTR. I HAVE BEEN TAKEN OFF THE SCHEDULE AND PLACED OFF DUTY UNTIL I CAN FULLY COME TO GRIPS WITH THESE EVENTS AND DECIDE WHERE I SHOULD GO FROM HERE.