I started playing the Dawnguard DLC before I finished the main quest line - I was right before that point where I had to find the Elder Scroll to defeat Alduin.
As I was playing the DLC, I got a bug where when taking the (Dragon) Elder Scroll, it disappeared, so I had to use a command to get it. That started the quest Alduin's Bane. I then finished the DLC, did a few side quests, and realized my mistake. When I travel to the Throat of the World to talk to Paarthurnax, he starts speaking, then stops after his monologue, and nothing else happens.
Is there is a way to set it back to the mission before Alduin's Bane without losing my progress?