My 2 cents....
Definitions:
CP is rejected: The immigration officer has found any one of the following
1. Terrorism (Wanted criminal, known terrorist, possible terrorist etc)
2. Medical grounds (HIV +, Acute TB, communicable disease etc)
3. Fraud (possible misinterpretation of facts, skewing the facts, malignant intent, intent of falsification to gain entry to US either now or in any previous instance)
Consequence:
Case 1: Your existing VISAs if any will be cancelled and you are denied entry into US for pemanently with possible arrest through extradiction.
Case 2: Your existing VISAs if any will be cancelled and you are denied entry into US for 10 years/pemanently.
Case 3: Your existing VISAs if any may or may not be cancelled and you may be allowed entry/denied entry into US for 3/5/10 years.
So, if you fall under case 1, don't know who could help you.
If you fall under case 2, God/doctors could possibly help you.
If you fall under case 3, God/Lawyers could possibly help you.
In case 2 & 3 with denied entry, you could do most of your stuff (like closing your bank a/c, terminating the lease) either through phone or though friends.
The easiest alternative that I know of is to give 'POWER OF ATTORNEY' to your MOST TRUSTED friend/relative and asking them to take care of the things.
Hope this helps.
Cheers,
Ganesh.