Charlotte Bronte Might have Died from Hyperemesis Gravidarum

I read this blog post on BronteBlog about how it was possible Charlotte Bronte died of Hyperemesis Gravidarum! I wonder how far back HG goes. I mean when was it first diagnosed?

Read the blog post here. (you have to scroll down about half way. The words "Hyperemesis Gravidarum" are linked.)