ALTDEV ALT EXCURSION DURING TEMP LOSS OF ACFT CTL.

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SECOND LEG OF FLT. FIRST LEG VFR WITH HVY TURB. REFUEL; FILE AT BARSTOW/DAGGETT ARPT. VFR CLB TO SOGGI INTXN. NUMEROUS FREQ CHANGES; DELAY BEFORE IFR PICK-UP. AGAIN; HVY TURB UNTIL ABOVE 7500 FT. GIVEN VECTORS 120 DEGS; THEN DIRECT PSP; THEN DIRECT TRM AT 9000 FT. CALM AIR. HEAD DOWN ON CHART. VERY ABRUPT ACFT MOVEMENT; PAX (DAUGHTER) CRIED OUT. FELT L ROLL AND PITCH UP. HEADS UP; 30 DEG L BANK; 10 DEG PITCH. STALL WARNING HORN. AIRSPD JUST BELOW 80 KIAS. NOSE DOWN; R RUDDER; R AILERON; CLB PWR. HDG OK; BUT ALT LOSS. VSI SCAN SHOWED RECOVERY FROM 1000 FPM DOWN TOWARD LEVEL FLT -- VERY SLOW RECOVERY. STOP DSCNT 8625 FT. VERY SLOW POSITIVE RATE; RECOVER TO 9000 FT ASSIGNED. AT TIME OF EVENT; RECEIVED TFC CALL WITH REQUEST TO VERIFY ALT. INFORMED CTLR IN 'DOWN DRAFT' CORRECTING SLOWLY TO 9000. HE WAS INITIALLY VERY DISTRESSED BUT DID NOT FURTHER COMMENT. I HAD BEEN BRIEFED FOR TURB; INCLUDING PIREP FROM 737 OF 'MODERATE CHOP' AT 11000 FT NEAR TRM. BY INCIDENT TIME; I HAD BEEN IN AT LEAST THAT FOR ABOUT 2 HRS OR SO. WHEN DSCNT OCCURRED; I HAD JUST BEGUN TO RELAX WITH SMOOTH AIR. MAINTAINED TURB AIR PENETRATION SPD JUST IN CASE WHICH LOWERED STALL MARGIN BUT MAY HAVE PREVENTED ACFT DAMAGE. THE INITIAL PITCH UP FELT LIKE ABOUT 2 G. IN RETROSPECT; I SHOULD HAVE NOTIFIED THE ATC OF MY SIT; BUT I COMPLETELY FORGOT ABOUT HIM IN THE ATTEMPT TO CTL THE ACFT. I ACTUALLY HAD TROUBLE FIGURING OUT WHAT HE WAS TALKING ABOUT WHEN HE CALLED BECAUSE OF LOSS OF SITUATIONAL AWARENESS. AFTER I LANDED AND THOUGHT ABOUT IT FOR SEVERAL HRS; I REALIZED THAT I HAD NOT THOUGHT TO FILE A PIREP; WHICH WAS A SIGNIFICANT OVERSIGHT; AS THE 737 CAPT HAD AT LEAST GIVEN ME SOME FORM OF WARNING. I GUESS I WAS THINKING ONLY OF MY SIT REGARDING THE ALT BUST. HOWEVER; IF THIS HAD BEEN A FULLY LOADED 172 WITH A 160 HP ENG; INSTEAD OF A LIGHTLY LOADED 180 HP MODEL; THE DSCNT WOULD HAVE BEEN MUCH FURTHER; PERHAPS WITH A STALL SPIN SIT. IN THE FUTURE; I WILL RECONSIDER MY RTE OF FLT WHEN I AM BRIEFED ABOUT SUCH AIR CONDITIONS IN HIGH MOUNTAINS. OVER THE DESERT THIS WAS AN UPSET. OVER HILLS; THIS MIGHT HAVE BEEN MUCH WORSE.