I'm Doug, and I'm sorry to hear of the confusion. My goal is to provide you with excellent service today.
You could have made an ex-spouse
claim to begin with---at age 62---so long as you were married 10 years or more, divorced at least 2 years and not presently remarried. You do not have to wait until he takes his benefit unless you have been divorced less than 2 years from him.
Yes, you can, and should apply for your ex spouse benefit. If the SSA determines that you should be getting a higher amount, you should also be able to get retroactive
amounts going back six months, as well. Six months is the maximum anyone may seek a retroactive retirement benefit though---even though you might have been eligible for it at age 62.
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I wish you the best in 2013,