"I have only been married to my husband for 2 years, but we have been together for 12 years. He has been supporting me the entire time. Will the judge be inclined to award me more in our divorce because of this. My husband is a very wealthy man."

Usually not. They will only go by the 2 years of marriage, which will disqualify you from alimony, but not from the separation of community property. As others have stated, you will need an attorney to determine what is community property, as your ex has been careful to minimize what is and isn't. Only an attorney could tell you if he has legally "squeezed" you out.

Another thing i want to ask is about prenuptial agreements. I was coerced into signing something right before we walked down the isle. The document was not notarized or witnessed by anyone. We had both been drinking that night and my better judgement was GONE. Could this document hold up in court?

You have 2 problems here. One, is you did sign it, and I suspect he will have no problem getting someone to testify they witnessed the signing....money is powerful.

"What would be the best way to go...deny the whole thing, claim I was not of sound mind or coerced, or simply question the validity?"

You can't deny it, if he can produce the document, as it will prove you a lier. You can't say you were not of a sound mind because of intoxication....otherwise his attorney is going to grill you about getting married 5 minutes later....that you were not of a sound mind then either. This cannot work in your favor. Your best angle is probably the validity, but if it is notarized, this won't work either.

You need an attorney. Your case goes far beyond the scope of what can be offered here.