Sorry this happened to you.
The good thing is that your husband is willing to understand your struggles. You are very lucky to have someone in your life who loves you that much because not everyone's partner is willing to go through therapy like this. I think he realizes how important therapy is for him right now.
Anyway, I don't always remember my manic episodes in full detail either, so that makes at least two of us... but I think a lot of people have the same issue.
I wouldn't worry too much about trying to remember details like that. I usually go nuts when I focus too much on remembering details that I know I can never remember 100%. I think the best thing to do is have your husband tell you what he saw, then use his feedback to help you piece together the puzzle. Best of luck