cpmoran,
D'Ecosse advise is right on. Loose this mechanic ASAP and go to someone who knows what they are doing. For a competent tech this is not rocket science, sounds like the guy went for a smoke and just never finished tightening everything.
Also that big nut, I believe it was mentioned before, should be crimped/staked AFTER it is fully tightened to never allow it to come loose.
Make sure you inspect the wheel studs too.
HTH, Good Luck
LarryB