WITH NUMEROUS ACFT WAITING TO CROSS A RWY AT DFW; THE CTLR ISSUES NUMEROUS CLRNCES WITH NO BREAK IN XMISSION; LEADING TO TWO RWY INCURSIONS AND MUCH CONFUSION.

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ACFT X LANDED RWY 18R AT DFW; EXITED HIGH SPEED AND WAS CLRED TO HOLD NUMBER TWO BEHIND COMPANY B757 AT TXWY BRAVO. COMPANY ACFT WERE WAITING AT WM; BRAVO; AND ALPHA TO CROSS RWY 18L. AN ACFT WAS CLRED INTO POS AND HOLD RWY 18L AND ADVISED OF TFC XING DOWNFIELD. THE COMPANY ACFT AT WM; BRAVO; AND ALPHA WERE CLRED TO CROSS RWY 18L. A SECOND S80 WAS BELIEVED TO BE CLRED TO CROSS 18L THAT WAS ACTUALLY BEHIND ME BEING # TWO AT BRAVO. ANTICIPATING THAT I WOULD BE NEXT CLRED ACROSS RWY 18L; I STARTED TAXIING TOWARD THE HOLD SHORT LINE; VACATED BY THE COMPANY B757. WHILE OBSERVING THE TFC ON ALPHA AND UPFIELD ON WM; I TAXIED PAST THE HOLDSHORT LINE BY HALF AN ACFT LENGTH BEFORE I REALIZED A XING CLRNC HAD NOT BEEN RECEIVED. AT THAT POINT THE WM TFC WAS STILL SLIGHTLY AFT OF MY ACFT AND I CONSIDERED THE MOST PRUDENT ACTION WAS TO CONTINUE ACROSS RWY 18L. NO LOSS OF SEPARATION NOR SAFETY WAS COMPROMISED. THE TWR FREQ WAS NONSTOP DURING THIS ENTIRE EVOLUTION. WE TAXIED OVER THE ALPHA BRIDGE; CONTACTED E GND AND TAXIED TO PARK WITHOUT FURTHER INCIDENT. I SUBSEQUENTLY CALLED TWR CHIEF; IDENTIFIED MYSELF AS CAPT OF ACFT X AND ASKED HIM TO REVIEW THE OCCURANCE. THE CAUSE OF THIS RWY EXCURSION WAS MY HEIGHTENED ANTICIPATION OF CROSSING CLRNC AMID COMPANY ACFT THAT WERE CLRED TO CROSS IN FRONT OF AND ON BOTH SIDES OF ME. SUPPLEMENTAL INFO FROM ACN 483370: LOCATION TXWY BRAVO; BTWN RWY 18R AND RWY 18L. WE WERE HOLDING SHORT OF RWY 18L AT TXWY B AFTER HAVING LANDED ON RWY 18R. TWR CLRED NUMEROUS ACFT TO CROSS RWY 18L; BUT HE DID NOT CLR US. NEVERTHELESS THE CAPT ADDED PWR AND STARTED TO CROSS. I TOLD HIM WE HAD NOT BEEN CLRED TO CROSS. HE SAID THAT HE REALIZED THAT; BUT TWR HAD CLRED EVERYONE ELSE AND THAT HE WAS GOING TO CROSS ANYWAY. I DID NOT TAKE ACFT CTL AWAY FROM HIM BECAUSE WHAT HE WAS DOING WAS NOT UNSAFE. WE FOLLOWED A B757 ACROSS AND THERE WERE NUMEROUS OTHER ACFT CROSSING SO THERE WAS NO ACTUAL CONFLICT. I MENTIONED THIS INCIDENT TO HIM ON THE TAXI IN AND AGAIN AT THE GATE. HE DID NOT SEEM CONCERNED ABOUT IT AND DID NOT PLAN ON SUBMITTING AN ASAP RPRT. I HATE TO SUBMIT A RPRT WITHOUT THE CAPT DOING THE SAME; BUT THIS IS BLATANTLY ILLEGAL AS FAR AS I CAN SEE; AND I FEEL I HAVE NO OTHER OPTION. SUPPLEMENTAL INFO FROM ACN 483371: HOLDING # 2 TO CROSS RWY 18L AT TXWY A. WE RECEIVED A RAPID FIRE CLRNC TO CROSS RWY 18L. BY THAT; I MEAN A LARGE # OF ACFT WERE CLRED IN MASS IN THE SAME XMISSION. I DON'T BELIEVE THE BREAK-BREAK TECHINIQUE WAS USED BY TWR. I STARTED ACROSS ALONG WITH ACFT AHEAD AND FO ASKED IF WE HAD BEEN CLRED. I SAID TO CONFIRM BUT THE FREQ WAS TOTALLY JAMMED AND WE GOT NO RESPONSE. BY THIS TIME I HAD STOPPED THE ACFT; BUT WAS ACROSS THE HOLD LINE. I LOOKED UP THE RWY; NO ONE IN HOLDING POS AND SAW A SECOND MD80 ON BRAVO XING AND A SECOND B757 AT THE NEXT TXWY NEAR THE MID POINT OF RWY XING. IN MY MIND; THIS CONFIRMED THAT TWR HAD CROSSED 2 SETS OF ACFT AND SINCE I WAS ACROSS THE HOLD LINE; I HELD THAT BELIEF WHEN THE FO TOLD ME SHE DID NOT HEAR A CLRNC TO CROSS. I BELIEVED I DID AND TOLD HER I HEARD A CLRNC AND CROSSED THE RWY. IN WRITING THIS I STILL THINK I HEARD A CLRNC; BUT CANNOT DISPUTE TWR'S ASSERTION AS I DID NOT GET UNEQUIVOCAL CONFIRMATION WITH MY FO. I DON'T EVEN KNOW IF SHE WAS ON FREQ WHEN I THINK I HEARD IT. OTHER FACTORS; 100 HR CAPT; EXTREMELY HIGH STRESS LOAD ON ME RIGHT NOW; MAYBE SOME GET HOMEITIS; BUT I DON'T THINK SO. RAPID FIRE MULTIPLE ACFT CLRNC RADIO CALLS; NO ONE WAY FREE RADIO FREQ TO GIVE TWR A CRITICAL MSG; THE WHOLE RWY XING-MESS.