changing website design

URGENT HELP NEEDED regarding attempt to change website design!  I am trying to rework a new website design while my current design remains.  I clicked on Change Design and looked at what was there.  I was never warned that I would lose my site.  I never published a replacement site.  My site appears to be gone, or at least it just shows "Error processing ssi file...Insert Headline..."  My site is SusansSumptuousSoaps.com.