EMS HELI PLT OF AN SMT TWIN HELI FLEW INTO IMC WHILE CONDUCTING A VFR FLT AT NIGHT AND CLBED TO VFR ON TOP.

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I DEPARTED ADDC) AT XX57 LCL (APPROX 10 MINS AFTER SUNSET). BY MY OBSERVATION PRE WX WAS 1000 FT CEILING 3 MI VISIBILITY OR A LITTLE BETTER; MY MOST RECENT WX CHK WITH THE FSS WAS IN THE AM; ABOUT 8 HRS OLD. I WAS WATCHING THE LCL WX CHANNEL ON TV AT FBO 1 HR PRIOR TO DEP. NOTHING INDICATED ANY LOW CLOUDS; RAIN; FOG FRONTS; OCCLUSIONS. ABOUT 10 MI NW OF XYZ I STARTED TO ENCOUNTER TOTAL BLACKNESS WITH NO VISUAL CONTACT WITH THE GND; EXCEPT FOR OCCASIONAL GND LIGHTS. VISIBILITY BEGAN TO DIMINISH 1-2 MI; THEN IMC IN FOG. I THEN FLEW INTO A SOLID IMC CONDITIONS. BEFORE I COULD EXECUTE A DECELERATION AND TURN; I WENT IMC AT 120 KTS AT 700 FT AGL. I THEN MADE AN IMC CLB TO 2700 FT WHERE I WAS ON TOP. AT THIS TIME; THE NURSE ASKED ME TO GO BACK TO ABC HOSPITAL BECAUSE THE PATIENT WAS NOT TOLERATING THE INCREASED ALT. I INFORMED THE NURSE I COULD NOT RETURN TO THE HOSPITAL AND THAT I WOULD HAVE TO CONTINUE TO ACC MEDICAL CTR IN XXZ OR WE COULD DIVERT TO YYY. OBSTRUCTION CLRNC ALONG THIS RTE REQUIRED I STAY AT 2500 FT OR ABOVE BECAUSE OF A TWR 10 MI E. I WAS IN THE CLOUDS FOR APPROX 5 MINS AND I WAS OVER THE TOP FOR AN ADDITIONAL 6-10 MINS. I DID CONTACT XA APCH ON 124.67 AND REQUESTED A WX UPDATE. THEY GAVE ME: XA 12000 FT OVER 7; XB CLR 10; XC CLR 10. I DECIDED NOT TO GO TO XC AND CONTINUED ON TOP TO HOSPITAL. THE WX BECAME CLR AND 15 PLUS 10 MI NW OF XC; I COMPLETED THIS LEG VFR. MY COMPANY HAS PLACED ME ON PROBATION FOR AN UNRELATED FUELING INCIDENT (SOLO REFUELING) AND I FELT IF I OWNED UP TO THIS IMC ENRTE I WOULD BE FIRED! I HAVE STATED TO MY DIRECTOR OF OPS THAT I ENCOUNTERED A THIN AND SCATTERED LAYER. MY COMPANY IS QUESTIONING ALL THE PEOPLE ON THE FLT AND HAVE STARTED TO GATHER FACTS FROM ALL SOURCES. I FEEL MY INFLT DECISION TO CLB WAS THE BEST WAY TO BE SAFE IN THIS INCIDENT. I REALIZE I HAD NO SEPARATION AND NO IFR FLT PLAN. MY ACFT WAS NOT UP TO SPD; VOR CHKS ETC. I AM NOT CURRENT ON INSTS AND PART 135 REG WOULD REQUIRE A SIC OR AN AUTOPLT WHICH I DID NOT HAVE. I HAVE LOGGED 6 APCHS AND 2 HRS OF SIMULATOR TIME IN DEC/XX/95. 1.8 HRS SIMULATOR AND 5 APCHS IN NOV/XX/95; SO I HAVE 3.8 HRS HOOD AND 11 APCHS IN THE LAST 90 DAYS; 3.9 HRS HOOD IN THE LAST 6 MONTHS. THE ACFT WAS A BH22-C CERTIFIED FOR DAY/NIGHT VFR AND SINGLE PLT IFR.