A DISTRACTED ATP PLT EXPERIENCED A RWY INCURSION.

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I PREPARED TO TAKE MY FAMILY BACK HOME IN MY ACFT. WE HAD BEEN STAYING AT A HOTEL TO ESCAPE HURRICANE FOR 8 DAYS. I WANTED TO RETURN TO CHK DAMAGE AT MY HOME. I LOADED THE ACFT; FILED A FLT PLAN AND PREFLTED THE PLANE. AFTER ENG RUNNING UP AND SYS CHK I CALLED FOR THE FLT PLAN; CHANGED TO GND AND WAS TOLD TO TAXI TO RWY XXL VIA TXWY A. WHEN ARRIVING AT THE DEP END; THERE WAS 1 CORPORATE JET IN LINE IN FRONT OF ME. WE SAT FOR SOME TIME AS IT WAS 'PUSH HR' AND THE TWR CTLR WAS VERY BUSY HANDLING BOTH RWY XXR AND RWY XXL; AT WHICH TIME THERE WAS A LNDG OR TKOF EVERY 2-3 MINS ON EACH RWY. THE CTLR WAS EXTREMELY BUSY; THE JET IN FRONT FINALLY TOOK OFF; AND I THOUGHT I WAS TOLD TO 'POS AND HOLD' ON RWY XXL. I THINK I REPEATED THAT AND COMPLIED. I SAT IN THAT POS FOR 2-3 MINS IN VIEW FROM THE TWR; FROM WHICH THERE WAS NO COMMENT. SUDDENLY I HEAR SOMEONE SAY; 'WHAT IS THAT ON THE RWY?' (NO CALL SIGN.) ABOUT 30 SECONDS LATER; I WAS OVERFLOWN BY AN ACR B737-500 SLIGHTLY OFF THE L SIDE OF THE RWY AND ABOUT 400 FT AGL. THE JET MADE A GENTLE SLOW CLBING TURN TO THE L AND DISAPPEARED FROM MY VIEW. I NEVER HEARD THE TWR SAYING ANYTHING TO THE ACR FLT. I WAS THEN ASKED TO TAXI OFF THE RWY; WHICH I DID; AT WHICH TIME I KEYED THE MIKE AND SAID 'YOU TOLD ME POS AND HOLD?' (THERE WAS NO RESPONSE FROM THE TWR) AND I RETURNED TO THE DEP END OF RWY XXL. AGAIN; THERE WAS ANOTHER CORPORATE JET IN FRONT OF ME. AFTER HE LEFT; I WAS ASKED TO HOLD SHORT OF RWY XXL WHICH I RESPONDED IN KIND. A MINUTE OR TWO LATER; I WAS TOLD TO PROCEED TO 'POS AND HOLD' TO WHICH I COMPLIED. I WAS THEN CLRED FOR TKOF AND THE TWR CTLR WISHED ME A PLEASANT FLT. I THOUGHT ABOUT WHAT HAPPENED ALL THE WAY HOME; BUT AT THAT POINT I THOUGHT THE CTLR HAD MADE THE ERROR. UPON ARRIVING AT DEST AND TAXIING TO THE FBO; GND CTL GAVE ME THE DEP ARPT TWR NUMBER AND TOLD ME TO CALL THEM. I CALLED AND WAS TOLD THAT I HAD ENTERED UPON RWY XXL WITHOUT A CLRNC. IN FACT; THE SUPVR TOLD ME HE HAD LISTENED TO THE TAPES AND THAT I HAD BEEN TOLD TO 'HOLD SHORT OF RWY XXL' AND I REPEATED IT BACK TO THE CTLR. I WAS STUNNED. I COULD NOT BELIEVE THAT HAD HAPPENED. HE TOOK DOWN MY AIRMAN'S INFO AND SAID 'YOU MAY OR MAY NOT HEAR FROM SOMEONE.' I COULD NOT BELIEVE I HAD PULLED SUCH A BONEHEAD MANEUVER. I NORMALLY CHK THE FINAL APCH COURSE FOR ACFT PRIOR TO ENTERING ANY RWY AS HABIT; EVEN THOUGH CLRED. I DID NOT DO THAT THIS TIME. THIS WAS MY FIRST MISTAKE. THIS WAS MORE THAN LIKELY BECAUSE I WAS FOCUSING ON GETTING HOME AND CHKING THE HOUSE. YOU CAN BE ASSURED THIS WILL NEVER HAPPEN AGAIN. I AM GOING TO DOUBLECHK EVERY CLRNC I GET AROUND ANY ARPT FACILITY IN THE FUTURE.