Honda crv troubles

Hi all, Had my automatic 05 honda crv in for a
service today, oil change and back brake pads
were changed, as I drove home it felt good but
suddenly it started vibrating almost like I was
driving on cobbles, i pulled over thinking i had a
puncture but it was fine, so i head off again, it was
fine for a bit but started vibrating again, when I got
home there was a smell of burning from the right
rear wheel, any suggestions pls and thanks,

Also the drive light on dash has been flashing on
occasion over the last week, had garage check
transmission fluid and it's fine, bring it back to the
garage tomorrow but dont want to look a fool so
advice would be appreciated, thanks