2004 Chevrolet Malibu Wheels Problems

IM HAVING SERIOUS BRAKE PROBLEMS I ALMOST HAD A MAJOR CAR ACCIDENT BECAUSE OF MY THIS PROBLEM. THIS CAR BRAKES BY ITSELF SPECIALLY WHEN I SPEED UP TO 50MPH AND ABOVE. AND ALSO THE BRAKE PEDAL WONT DISENGAGE BY ITSELF WHEN BRAKING AND THE WHOLE CAR STARS SHAKING UNCONTROLABLE. AND IM AFRAID EVERYDAY MORE AND MORE THAT I MIGHT KILL MYSELF DRIVING THIS CAR BECAUSE THIS IS MY ONLY CAR I HAVE AND DRIVE EVERYWHERE I NEED TO GO SPECIALLY NOW THAT IM EXPECTING A BABY BOY I CONSTANTLY NEED CHECK UPS IN MY CLINIC I GO TOO. MOST OF MY BRAKING PROBLEMS ACCURED WHILE IM DRIVING ON THE FREEWAY BUT SOMETHING I DONT NEED TO BE ON THE FREEWAY FOR ALK THIS TO HAPPEN.

WHILE DRIVING WENT TO PUT ON THE BRAKES AND THE DRIVER SEAT MADE A LOUD THUMP AND SHIFTED FORWARD TO THE RIGHT I HAD TO GRIP THE STEERING WHEEL AND PULL OVER BECAUSE THE SEAT WAS LEANING FORWARD TO THE RIGHT AND MADE IT HARD FOR ME TO DRIVE. I GOT OUT AND THE BAR UNDER THE SEAT THAT GUIDES THE SEAT WAS BROKEN HAD TO MANUEVER IT TO DRIVE AFTER PUTTTING A BLOCK OF WOOD UNDER IT TO STABALIZE THE SEAT SO I COULD DRIVE. HAD NEW TIRES, LUGS AND NUTS PUT ON CAR IN JUNE ALONG WITH ENTIRE SUSPENSION SYSTEM FORNT AND BACK AND WHEEL ALIGNMENT AND ON TWO OCCASIONS MY LUGS HAD TO BE CHANGED DUE TO BREAKAGE OR LUGS COMING UNSCREWED AND DROPPING OFF ON FRONT DRIVERSIDE AND BACK PASSENGER HAD CAR CHECKED AND THERE APPEARS TO SEVERAL MECHANIC SHOPS NOTHING VISIBLY WRONG BUT THIS IS A SURE SAFETY HAZARD.