Greetings. I am sorry to answer this after you leave, but yes, you can file for custody as soon as you get back. Yes, you can revoke your consent to the agreement prior to her signing the same, although you should do so in writing.
As far as using your financial accounts, you may or may not have a criminal action since she is your spouse and did these actions while you were married. Nevertheless, I would check with the district attorney where you live. Best of luck.
Janet L. Fritts
Attorney at Law
4101 Lake Boone Trail, Suite 500
Raleigh, North Carolina 27607
The response posted above is based upon the limited factual information made available and is not intended as a full and complete response to the question. The only reliable manner to obtain complete and adequate legal advice is to consult with an attorney, fully explain your situation, and allow the attorney sufficient opportunity to research the applicable law and facts required to render an accurate opinion. The basic information provided above is intended as a public service but a full discussion with an attorney should be undertaken before taking any action.