A local friend of mine just posted her "what might have helped" blog post regarding her current pregnancy (which is her seventh-or-so time through hyperemesis). Here it is!
Morning Sickness Update
You can read this author's original post about severe morning sickness here - I encourage everyone to read it, because it is a great picture of hyperemesis.
You will notice that a lot of these tips are "pre-HG" - i.e. you can use them up until HG is in full swing, at which point (as we all know) a lot of tips switch from helpful to impossible. But anything is worth a try - thanks for sharing!