Your citizenship is done. It will not be revoked unless there is an investigation for fraud ... unlikely such an investigation will start by itself, and again it does not mean you did something wrong.
Divorce ... this forum knows immigration laws. You need to check your state's marriage and divorce laws. Unlikely you will find that help here.
GC: EB1: 1999 ==> 2004. 3 yr delay due to lost file. N400: San Jose. Apr'09 ==> Aug'09.
I am not a lawyer, forum police, moderator, moralizer or an immigration officer. If I sound like one, use "your" best judgement.