1989 Buick Century BIG PROBLEM WITH Buick Century 89

JUST TWO AGO; MY 1989 BUICK CENTRUY STARTED CREATING A NOISE THAT SOUNDED LIKE A BEARING WAS OUT OF PLACE; EVERY TIME I INCREASED MY SPEED THE VIBRATIONS OF THE MECHANICAL NOISE INCREASED. THEN ALL IT JUST STOPED. IT FELT LIKE THE CAR JUST DIED; AT FIRST THE ENGINE OIL LIGHT CAME ON AND JUST WOULDNT START AGAIN. DURING THE MONTH BEFORE PEOPLE WHERE TELLING ME THAT I HAD A TRANSMISSION PROBLEM AND NEED OIL, BUT THEIR WAS OIL. SO WAS IT MY ALTERNATOR?