My front end of car, is higher, than the back end of car. Shocks needed? on 2004 Buick Rainier

I was going to work this morning when I noticed that the back end of my car was lower than my front end. Both rear wheels seem lower than the front wheel. I had my wheels rotated a few weeks ago. And I noticed that my front brakes seems to be making a grinding noise. They are not squeaking, but just a grinding sound.

Asked by for the 2004 Buick Rainier
do you have airbag suspension?