Honestly, sounds like a waste of time.
My friend was in a similar situation. He tried for a few years to get his first marriage annulled after discovering that his wife had misled him about her fertility issues. He jumped through all the hoops, filed a mountain of paperwork, went up the chain as far as he could. I'm pretty sure he even reached out to the mad hatter, Pope Benedict XVI himself!! All to no avail. His church wouldn't budge on the matter since Catholics aren't too keen on the whole idea of annulment. After a rather contentious process he finally said f@#$ it, left the Catholic church and started his own religion. As head of the newly formed Church of Englund (Englund is his last name), he granted himself an annulment and got remarried a month later. Easy peasy.
I'd like to say that it all worked out for him and his family, but that's another story. The point is, annulments are for kitties.