Jim just said that Sheets is feeling better today and that he may not have to miss a start. And something about more information on his blog at SportsBubbler.
You can look it up on ESPN.com's stat page; looking at the 'Team Pitching' page and the 'As A Reliever' filter. Although, this produces results of Cubs 43.2 and Brewers 30.0 EDIT: I'm getting slow in my old age.