Yeah it is crap when you are in a patch like that.
I can't really give advice where to go for the dress but I am sure your friend does not want it to become a major headache for you.
I have been in a similar situation for a couple of family weddings and my 40th and basically I have taken myself into a local boutique with a wonderful sales assistant and have tried in everything in my size. I had three winners for different reasons. I don't know if there is a local place like that nearby.