2003 BUICK PARK AVENUE Electronic Stability Control Esc Problems

I WAS DRIVING HOME FROM WORK. SUDDENLY LIGHTS STARTED GOING OFF ON MY DASHBOARD INDICATING THAT MY ABS, TRACTION CONTROL, AND SATIABILITY CONTROL WERE OUT. NOT BEING ABLE TO STOP ON THE HIGHWAY OR CONTACT SOMEONE TO GIVE ME A LIFT HOME I PROCEEDED TO THE NEAREST BUICK DEALERSHIP TO SEE WHAT THE ISSUE WAS. DURING THE JOURNEY THE LIGHTS TURNED OFF, BUT THINKING IT WAS AN ELECTRICAL PROBLEM I STILL HEADED TOWARDS THE DEALERSHIP. THE CAR WAS LOOKED AT BY A SERVICE TECH. I WAS TOLD MY BRAKE MODULE COMPUTOR WAS OUT AND I NEEDED A REPLACEMENT. THE COST WAS ROUGHLY $1200, KNOWING I COULDN'T AFFORD IT, I ASKED IF THEIR WAS A SAFELY RECALL. THEIR WAS NOT. I ASKED IF THE VEHICLE WAS SAFE TO DRIVE HOME, THE MAN SAID HE DIDN'T SEE WHY NOT. THINKING THIS MEANT MY BRAKES WERE FINE AND NOTING THAT THE LIGHTS WERE...