I am sorry for your situation but perhaps the following will help.
There is a specific OK statute that provides for vacating or dissolving the divorce decree. Here it is:
Title 43. MarriageParenting Coordinator
Current through 2013 Legislative Session
§ 133. Dissolution of Divorce Decree
When a decree of divorce has been issued by a district or superior court, said court is hereby authorized to dissolve said decree at any future time, in or out of the term wherein the decree was granted, provided that both parties to the divorce action file a petition, signed by both parties, asking that said decree be set aside and held for naught. And further provided that both parties seeking to have the decree set aside shall make proof to the court that neither one has married a third party during the time since the issuance of the decree of divorce.
Cite as § 133
This should be a quick case. You file a verified petition, meaning you both sign the petition under oath stating you want the divorce decree dissolved and also stating that neither of you remarried after your divorce was granted. I am not sure if outside third party proof is required regarding proving no remarriage
, as in do you need to get a certified statement from the marriage license office that neither of you received a marriage license after the divorce. I doubt that is required because you could have been married later in another state. So you should be able to get the order dissolving the Decree on the same day that you file petition. You have to do this in the same court that granted the divorce decree.