I had the same thing...
How far post partum are you? I'd like to go into all the details with you, because I think my dr handle it really well, but I'd rather not go into all the gory details in public.
PM me if you want them. But here's a basic non-gory summary... My nurse practitioner--whose opinion I respect--wanted me to not have it treated with the estrogen cream until I was at least a month into solids for ds (so he was 7 mo before I saw an ob/gyn about it). Part of this was to see if I would get more estrogen naturally (by ds spacing out his feedings and maybe nursing a bit less, etc.), part of it was to make sure I had a really good milk supply before trying the estrogen.
The long and the short of the dr appt was that he told me to use no more than a pea sized amount vaginally every day for a week, and then every other day for a week, and to see from there. Doing this didn't help a lot, but then I took a week off and repeated the above, and everything is much, much better.
I still haven't gotten my period though. I'm vegan and eat a lot of soy, too.
I don't want to worry you, but I think the amount of cream my dr prescribed was more reasonable than a 6 week daily applicator-full.