PA46 MALIBU PLT ENTERS IMC WHILE FLYING VFR.

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DEPARTED MYF SAN DIEGO RWY 28R VFR. REQUEST OF SOCAL FLT FOLLOWING DIRECT CARLSBAD DIRECT DAG. CLB REQUEST TO 17500 FT; HELD FOR 5 MI AT 11500 FT FOR TFC. NOTICE CLOUDS BUILDUP; ASK FOR 17500 FT. TO CLR TOLD TO SQUAWK 1200. CTL TOO BUSY; CALL LATER; 10 MI OR SO CALLING CTR ADVISE I NEED IFR TO CONTINUE. NEEDING TO CLB AND DIVERT COURSE TO STAY CLR. I WAS GIVEN A SQUAWK CODE BUT NO IFR CLRNC. I HAD NO OPTION BUT TO CLB AND STAY BTWN CELLS. CTLR WOULD NOT GIVE ME AN IFR CLRNC OR ALT. INSISTED I MAINTAIN VFR WHICH I COULD NO LONGER DO. CTLR THEN ASKED ME TO DO A 180 DEG TURN (I SHOULD HAVE NOT DONE SO). I RAN RIGHT INTO THE THICK OF IT; ALMOST LOST CTL OF THE ACFT; ICE; TURB; UPDRAFTS; DOWNDRAFTS; ALL THE WHILE ASKING FOR HELP; 'I NEED IFR CLRNC.' SHE REFUSED; 'CAN'T DO.' I HAD TO FLY THE ACFT AND GET OUT OF THAT BAD AREA; USING MY STORM SCOPE AND XM WX DISPLAY. IF SHE HAD ALLOWED ME AN IFR; ON THE HDG I WAS ON BTWN 2 CELLS BEFORE SHE GOT ME TO DO A 180 DEGS; I WOULD HAVE BEEN ALRIGHT THEN DIRECT TO DAG.