If you are stuck far away in the game, and you have gone as far as you can with the current gear, DON"T BOTHER WAITING for the AH to come back so you can receive the items you bought...
Because we don't have an ESTIMATED time frame, we might be waiting for nothing...
Just go to sleep(if that's the case) and hope it's back up when you wake up.
--Advices if AH is up when you wake up, but your items/gold are missing.
1) Don't make a ticket yet, because of the delay, call blizzard at their toll free.
a)if you reach a good professional, you will be able to resolve your problem,
b)if you don't reach a good professional, try calling again, you might get some one else
c)if they give you an excuse that they can't help you over the phone several times(different reps), report blizzard to BBB.
The same way BBB resolved the WAVEE issues,(site closed down) they will help us here too if they receive massive emails.(I am 100% sure)
Good luck mates.