I don't like to do this on this great forum but there seem to be a lot less responses than in the past here and my heart goes out to you with your puppy. I don't know too much about parvo except that it is a serious illness; however I believe a reasonable proportion of puppies can survive. Basically the vet is the best person to advise, and I hope you have a good one.
You could try posting on these rather more active bulldog forums -
http://www.englishbulldognews.com/forums/http://www.bulldogsworld.com/forum