ZFW INVOLVED IN OPERROR BTWN AN A319 AND A B752 DURING ADVERSE WX FACTORS AND SIGNIFICANT HOLDING; WHILE ATTEMPTING TO THREAD ACFT DOWN THROUGH A HOLDING STACK.

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WX (THUNDERSTORMS) COVERED THE NW PORTION OF FT WORTH CENTER AIRSPACE AND ADDITIONAL WX WAS JUST ESE OF ZFW AIRSPACE IN HOUSTON AND MEMPHIS CENTER AIRSPACE; CREATING A CORRIDOR OF CLR AIRSPACE THAT RAN FROM THE NE TO THE SW. OF THE 6040 ACFT THAT TRANSITIONED THROUGH FT WORTH CENTER; APPROX 3500 PASSED THROUGH CQY AIRSPACE WITH NO ADDITIONAL STAFFING TO ASSIST. I TOOK OVER FZT-H SECTOR JUST AS DFW APCH SHUT OFF ALL ARRIVALS DUE TO THUNDERSTORMS AT XA40 LOCAL TIME. THREE ACFT HAD ALREADY PASSED THE HOLDING FIXES AND HAD TO BE BROUGHT BACK TO THE WEIRS INTXN. FROM XA40 UNTIL XC15; WHEN I WAS RELIEVED FROM POSITION; THERE WERE 14-16 ACFT HOLDING AT THE Z HOLDING FIXES IN FZT-H SECTOR; AND A SIMILAR NUMBER HOLDING IN THE LOW ALTITUDE SECTOR BELOW. BOTH DFW AND DAL ARPTS WERE CLOSED FROM XA40 TO XB50; YET HOUSTON TERMINAL DEPARTURES ENRTE TO THE ARPTS CONTINUED TO DEPART AND ENTER FZT-H AT FL240; FL260 AND FL280. THROUGH VECTORING UNTIL THE ALTITUDE WAS AVAILABLE; THESE ACFT WERE BLENDED INTO THE STACK. ACFT X AT FL310 AND ACFT Y AT FL330 ARRIVED FROM THE E. ACFT X CONTINUED PAST WEIRS TO THE NW; AND WAS TURNED LEFT TO PROCEED BACK TO WEIRS WHEN ACFT X WAS 15 MILES N OF WEIRS. ACFT Y MADE THE TURN IN THE HOLDING PATTERN AND WAS DSNDED TO FL290 TO GET BELOW ACFT X BEFORE HE ARRIVED IN HOLDING DUE TO LACK OF ADEQUATE BREAKS AND A CONSTANT INUNDATION OF TFC FOR 6 HRS; STRAIGHT; I MISSED THAT ACFT Y DIDN'T IMMEDIATELY START HIS DSCNT. I WAS BUSY TRYING TO GET 3 ACFT DOWN FROM FL260; FL270 AND FL280 TO FL250; FL260 AND FL270 SO THAT A HOUSTON DEPARTURE ON VECTORS COULD BE FIT INTO THE STACK AT HIS CURRENT ALTITUDE OF FL280. SEPARATION WAS LOST 3 MINS AFTER DSCNT CLRNC WAS GIVEN TO ACFT Y.