All you need to do is reset your expectations and be happy if you get the room type you originally booked!
I stayed at the Hilton Memphis this week and was "downgraded" the morning of my arrival by the hotel (i.e. hotel staff changed my booking from a pre-booked executive room/rate to a regular room without adjusting the rate!). It took a full 2 hours of frustration talking to 3 different people to finally get an executive room - and not the original King bed that I had reserved. Should I be angry as a Diamond member? Not if I recalibrate my expectation.

Don't expect upgrades with Hilton - just be apprecaitive if they don't downgrade your reservation!

If things really go bad, just tell yourself that it is better than getting a sharp stick in the eye.
SG