Hear humming sound, like something rotating is brushing against something.

What is your question?

Since going to AutoZone for an oil change, I hear a humming sound. It gets louder as I go faster and quieter when I slow down. Also, I heard some strange clicks today coming from, it seemed, control panel. The TRAC OFF light comes on momentarily (researched it and this may be nothing since it doesn't stay on).

What makes this problem better or worse?

accellerating worse, and vice versa

How long has your 2000 Buick Century had this problem?

less than a week; after AutoZone oil change